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Rules
The Mystara campaign
Mystara specific rules
The Red Curse and the Savage Coast
Game mechanics
Game mechanics
Campaign economics
Construction
Creatures
Dungeoneering
Encounters
NPCs
Trade
Combat and warfare
Aerial Combat
Combat
Martial arts
Swordsmanship
Warfare and mass combat
Pricing
Weaponry and Armour
Magic items
Characters
Ability scores
Alignment
Characters
Experience
Mastery
Psionics
Saving Throws
Skills UPDATED
Weapon mastery
Game conversions
Converting between different editions of D&D
Converting from other systems
General rules
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Cyclopedia Companion - an unofficial players supplement for classic D&D and OSR games by Cab Davidson, from The Piazza posted 20 May 2024.
Cyclopaedia Compendium volume 2 - an unofficial DM's supplement for classic D&D and OSR games by Cab Davidson, from The Piazza posted 13 December 2023.
Collection of Sage Advice from Dragon Magazine version 1.0 compiled by Alberto Giuffrida, current as of 9 October 2023.
BECMI tweaks by Robert J. Nuttman, Jr., from The Piazza posted 21 October 2022.
House rules by Parzival, from The Piazza posted 21 October 2022.
BECMI Indexes: Rules by Peter current as of 3 May 2020.
BECMI / RC House Rules by Craig Antoun from The Piazza posted 24 August 2015.
BECMI / RC House Rules by Jody Hong from The Piazza posted 7 August 2015.
Library of Tinkering: Custom Rules for the Mystara Campaign Setting by Donald Eric Kesler, Sarah Kesler and Bob Wagstaff, current as of 17 December 2011.
House Rules from Celebrity Game Table: the Tegel Campaign by Philip Athans from Wizards of the Coast posted 18 October 2003.
Optional rules for a more basic campaign by Jeff Querner and Angelo Bertolli current as of 6 June 2001.
House Rules by Angelo Bertolli current as of 6 June 2001.
Rules Review by Tomás Sánchez, from the Mystara Message Board posted 27 December 1999.
Random Events by Kenneth Baggaley from the AOL Mystara Message Board posted 2 January 1997.
The Mystara campaign
Mystara specific rules
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Spell of Preservation/Cultural Pride in D&D 5E by Håvard from The Piazza posted 26 February 2019.
The Radiance for 3.5 by Håvard from the Mystara Mailing List posted 22 March 2004.
Petitioning for Immortality by Jacob Skytte, from Tome of Mystara issue 6 dated 11 June 2001.
Spell of Preservation by James Ruhland, from the Mystara Message Board posted 17 December 1999.
The Red Curse and the Savage Coast
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Dungeons of Drakkenheim Eldritch Contamination - Red Curse for 5e? by GavinRuneblade, from The Piazza posted 1 December 2021.
Rules for Legacy and Affliction in 3E by Trevor Mellis, current as of 10 August 2001.
Differences between the D&D and AD&D red curse rules by David Knott, from the Mystara Mailing List posted 19 July 1998.
Game mechanics
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Interrogating Captives: Reaction Roll by Anarion_Elendili, from The Piazza posted 17 April 2024.
On healing ... by Parzival, from The Piazza posted 19 January 2024.
On healing ... by Craig Antoun from The Piazza posted 19 January 2024.
On healing ... by Anarion_Elendili, from The Piazza posted 18 January 2024.
Lock and Trap Quality by Anarion_Elendili, from The Piazza posted 18 December 2023.
Lock and Trap Quality by Håvard from The Piazza posted 16 December 2023.
Minor versions of Cure Disease and Neutralize Poison by Anarion_Elendili, from The Piazza posted 16 October 2023.
Minor versions of Cure Disease by LibraryOgre, from The Piazza posted 10 October 2023.
Strongholds & Dominions for Nomadic cultures by Marc Saindon, from the Mystara Facebook group posted 4 September 2023.
Gathering rumours by Cab Davidson, from The Piazza posted 31 May 2023.
Dragon Steeds Pt. 3 by Bruce Heard, from About Bruce Heard and New Stories dated 9 March 2023.
Dragon Steeds Pt. 2 by Bruce Heard, from About Bruce Heard and New Stories dated 6 March 2023.
Dragon Steeds Pt. 1 by Bruce Heard, from About Bruce Heard and New Stories dated 28 February 2023.
Slugs and Griffons and Stuff, Oh My! by Bruce Heard, from About Bruce Heard and New Stories dated 23 January 2023.
Gnus and Llamas and Moose, Oh My! by Bruce Heard, from About Bruce Heard and New Stories dated 16 January 2023.
Horses and the hero shield by Ashtagon, from The Piazza posted 11 January 2023.
Simple Horse Mechanic by Francesco Defferrari, from The Piazza posted 11 January 2023.
Horses and Donkeys and Mules, Oh My! by Bruce Heard, from About Bruce Heard and New Stories dated 9 January 2023.
Mystara Tribes as Organizations by Håvard from The Piazza posted 7 January 2023.
Pages From the Notes of Crossandra, Professor of Alchemy by Cab Davidson, from The Piazza posted 14 October 2022.
Expanded Monster XP reference chart from the Rules Cyclopaedia by Bruce Heard, from the BECMI Facebook group posted 3 October 2022.
Alternate D&D Monster XPs by Bruce Heard, from About Bruce Heard and New Stories dated 2 October 2022.
Blessed Salt, Holy Water, and The Many Different Ways to Kill Undead by Galdor from Threshold Magazine issue 29 dated 1 July 2022.
Aging and Fertility of various Races by Robin, from The Piazza posted 29 January 2022.
Fear system by Ryleth, from The Piazza posted 16 December 2021.
BECMI Adventure Design by Håvard from The Piazza posted 10 August 2021.
[Dominions] Natural and Unnatural Disasters by Giampaolo Agosta, from The Piazza posted 28 July 2021.
Natural Healing and Halfling Cooking by Håvard, from The Piazza posted 11 July 2021.
Strength Adjustment for Encumbrance by John Adams, from the BECMI D&D Facebook group posted 3 April 2021.
Travelling by ship by Robin, from The Piazza posted 30 March 2021.
Excel sheet for Automatic calculation of terrestrial travel distances based on Rules Cyclopedia (in Italian) by Matteo Zampini, from the Mystara Italia Facebook group posted 14 October 2020.
Ship Speeds Revisited by Bruce Heard, from About Bruce Heard and New Stories dated 5 July 2020.
Swimming: And all matters concerning being in or below water as per Mystara BECMI D&D by Robin from Breath of Mystara 12 June 2020.
Overland Movement by Robin from Breath of Mystara 24 October 2019.
Corporeal conditions table by Robin, from The Piazza posted 16 April 2019.
"So, You All Meet in a Tavern...." by Robert J. Nuttman, Jr., from Threshold Magazine issue 22 dated 6 March 2019.
Morale and ocean voyages by Robin, from The Piazza posted 7 December 2018.
Skyship Saving Throws by Bruce Heard, from About Bruce Heard and New Stories dated 6 August 2018.
Encumbrance house rules by Emanuele Betti, current as of 8 April 2018.
D&D Ships MV Rates by Bruce Heard, from About Bruce Heard and New Stories dated 11 November 2017.
All about doors by Robin current as of 9 February 2017.
Infectium Morbis et Rigidum (Diseases and Afflictions) by Robin current as of 9 February 2017.
Adventure Hooks, Red Herrings & the Information Mesh by Sean Meaney, from Threshold Magazine issue 14 dated 22 January 2017.
A note on lycanthropy and humanoids by Robin, from The Piazza posted 5 October 2016.
Post-Adventure Weariness by Håvard from The Piazza posted 21 April 2014.
Alternate XP System by Håvard from The Piazza posted 31 March 2014.
The Lost Tables: Jumping and Falling by Robin from Breath of Mystara 27 October 2013.
Wounds and Injuries by Robin from Breath of Mystara 30 September 2013.
Food, water and fuel, tabular information by Robin from Breath of Mystara 17 September 2013.
Alcohol by Robin from Breath of Mystara 5 April 2013.
George Hrabovsky's Rules Cyclopedia-based Mystara Game by George Hrabovsky, from The Piazza posted 4 April 2012.
4e-inspired THAC0/AC system by Giampaolo Agosta, from The Piazza posted 23 August 2009.
Spellcasters For Hire by Scott Moore, current as of 4 July 2004.
Handling Poison by Angelo Bertolli current as of 6 June 2001.
A New Dimension to Taverns: Optional Rules for Alcohol Consumption and Intoxication by Geoff Gander, from Tome of Mystara issue 2 dated 14 January 2000.
Insanity, Horror, and the Outer Beings in Mystara by Geoff Gander, from the Mystara Message Board posted 2 June 1999.
City Votes by Kenneth Baggaley from the AOL Savage Coast/Red Steel Message Board posted 23 November 1996.
Campaign economics
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Realistic Mystara Spellcasting Services and Spellcaster Income by Aoz, from The Piazza posted 23 February 2023.
Updated dominion and trade rules by Fabrizio Nuzzaci from Threshold Magazine issue 29 dated 1 July 2022.
Spellcaster Pay by Aoz, from The Piazza posted 4 December 2021.
Domain Economics - an expansion by Giampaolo Agosta, from The Piazza posted 12 March 2019.
Adventurer's Guild by Irving Galvez, current as of 20 September 2017.
Costs for Hirelings and Mercenaries by Irving Galvez, current as of 12 September 2017.
Regni and Nobilità: Modulo per la Gestione dei Possedimenti (Italian) version 1 by Omnibius current as of 17 April 2012.
Thoughts on Class Bonuses in the Dominion System by Håvard and Giampaolo Agosta from The Piazza posted 30 September 2011.
Hollow World Barter System/Alternate Economies by Andrew Theisen, from The Piazza posted 3 September 2010.
Kingdom of Eusdria: population and military by Giampaolo Agosta from the Mystara Mailing List posted 25 April 2002.
Calculations with Dominions by Mike Harvey, from the Mystara Message Board posted 22 February 2001.
The City States Economics an example AC 1000 by Bruce Heard, from the Mystara Message Board posted 17 September 1999.
Bellissarian Economics an example by Bruce Heard, from the Mystara Message Board posted 13 January 1999.
Dominion Economics excel file by Bruce Heard, current as of 22 July 1999 and updated to excel 97-2003 workbook format.
Dominion Economics 101 by Bruce Heard, from the Mystara Message Board posted 21 January 1999.
Known World Grimoire: Letters and more economics by Bruce Heard from Dragon Magazine 189 published January 1993.
Construction
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A Watchtower by Sean Meaney, current as of 6 September 2005.
Cost of a thieves hideout with cover building by John Hare, from the Mystara Message Board posted 18 January 1999.
Ship and dock construction by Marco Dalmonte, from the Mystara Message Board posted 12 November 1998.
The cost of building a tavern by Bruce Heard, from the Mystara Message Board posted 6 October 1998.
The cost of building a hovel by Bruce Heard, from the Mystara Message Board posted 6 October 1998.
Building it excel file by Bruce Heard current as of 12 January 1999.
Building it, examples by Bruce Heard, from the Mystara Message Board posted 29 December 1998.
Building it version 3, the cost of construction by Bruce Heard, from the Mystara Message Board posted 29 December 1998.
Labour Issues by Bruce Heard, from the Mystara Message Board posted 6 October 1998.
Building description - knights' hostel by Brant Guillory, from netMAG 3.
Building description - knights chapterhouse by Brant Guillory, from netMAG 3.
Known World Grimoire: Castles Revisited by Bruce Heard from Dragon Magazine 193 published May 1993.
Creatures
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Disease by Anarion_Elendili, from The Piazza posted 16 October 2023.
Squads by Michael Haneline, from the BECMI Facebook group posted 14 August 2021.
Creature subtype: Exalted by Jamie Baty from the Mystara Message Board last updated 14 March 2007.
Monster Mastery by JJJ, from the Mystara Mailing List posted 12 December 2002.
Dungeoneering
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Dungeon Design 101: Subsidence in Dungeons, Mines, and Caves, with sample dungeon: The Village Chief's Tomb by Sean Meaney, current as of 30 May 2020.
Dungeon Geomorphs by Rodger Burns, from The Piazza posted 15 February 2011.
Tslani Ruins, Geomorphs by Rodger Burns, from The Piazza posted 15 August 2010.
Encounters
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On the Surface of the Sunlit Sea by Senarch from Threshold Magazine issue 32 dated 21 September 2023.
Using The Monster Reaction Rules as Social Interaction Rules Mechanics by Håvard, from The Piazza posted 3 January 2022.
Monster Reaction Table by Zach Henderson, from the BECMI Facebook group posted 26 October 2021.
City Encounters by Bruce Heard, from About Bruce Heard and New Stories dated 12 January 2021.
Random Encounter Tables by Angelo Bertolli current as of 6 June 2001.
NPCs
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NPC quirks by Ann Dupuis, from the Mystara Reborn Facebook group posted 5 November 2019.
Statistics for Commoners by Robin, from The Piazza posted 26 July 2017.
NPC building technique by Beau Yarbrough, from the Mystara Mailing List posted 30 April 2000.
Rules for expanding upon non-combatant humans by Mike Harvey, from the Mystara Mailing List posted 24 March 1998.
Noble NPCs by Kenneth Baggaley from the AOL Mystara Message Board posted 30-31 December 1996.
Trade
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Overhauling the GAZ 9 & 11 trade good prices and weights by Anarion_Elendili, from The Piazza posted 1 November 2023.
Updated dominion and trade rules by Fabrizio Nuzzaci from Threshold Magazine issue 29 dated 1 July 2022.
Trading Caravans Overland by Jeff Larsen, current as of 12 October 2021.
Merchant Ship Trading Rules by Jeff Larsen, current as of 12 October 2021.
Combat and warfare
Aerial Combat
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Aerial Bombing by Bruce Heard, from About Bruce Heard and New Stories dated 20 April 2023.
Rules for Mass Aerial Combat by Aaron Nowack, from the Mystara Mailing List posted 14 April 1998.
Combat
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DM Screen elements: Combat Sheet, Attack and Saves Sheet by Eric Forster, from the D&D BECMI Facebook group posted 13 July 2024.
Initiative and spellcasting by Parzival, from The Piazza posted 10 June 2024.
BECMI Initiative House Rule ideas by DM Nedleeds, from The Piazza posted 10 June 2024.
More BECMI/Mystara Combat Manouvers by Paul Dupuis, from The Piazza posted 28 April 2024.
BECMI Initiative House Rule ideas by Håvard from The Piazza posted 21 April 2024.
Critical Fumbles by Ralph Schimpl, from the BECMI D&D Facebook group posted 5 January 2024.
Table of 50 Critical Hits for D&D by Ali Monfis, from the BECMI D&D Facebook group posted 5 January 2024.
BECMI Fumble Tables by Anarion_Elendili, from The Piazza posted 23 November 2023.
Attack Bonuses by Craig Antoun from The Piazza posted 2 July 2023.
Base Attack Bonus and BECM D&D by Khedrac, from The Piazza posted 3 February 2023.
Maneuvers in BECMI by Matteo Zampini, from the BECMI Facebook group posted 24 September 2021.
Critical Hits and Fumbles by Robin, from The Piazza posted 11 January 2021.
Weapon Mastery blended into General Skills by Robert J. Nuttman, Jr., from The Piazza posted 16 November 2020.
Rules for Wrestling (Grappling) in D&D by Cab Davidson, from Thoughtful Nerd posted 9 April 2020.
House rules for light melee weapons by Parzival, from The Piazza posted 29 December 2019.
Nithian Themed Fighting Styles by argentmantle from The Piazza posted 11 April 2019.
Assassin's Creed Fighting Styles by argentmantle from The Piazza posted 11 April 2019.
The Lost Tables: Initiative by Robin from Breath of Mystara 16 February 2014.
Alternate Initiative System by Bruce Heard, from About Bruce Heard and New Stories dated 4 March 2012.
Striking Procedure strangeness by Antonio Eleuteri from The Piazza posted 14 January 2011.
Breakdown of phases in a Combat Round by Blacky the Blackball from the Piazza posted 3 January 2010.
Breakdown of actions in a Combat Round by Giampaolo Agosta, from The Piazza posted 1 January 2010.
Combat Stunts by Jacob Skytte, from the Mystara Mailing List posted 3 February 2003.
OD&D/AD&D Flexible Combat by Scott Ludwig, from the Mystara Message Board as of 31 August 2001.
The Continuous Combat System by Jim Bobb, from the Mystara Mailing List posted 13 August 1999.
Variant Combat System by Tracy A. Bandy, from the Mystara Mailing List posted 10 June 1996.
Some aspects of the combat system by Oeystein H. Lund, from the Mystara Mailing List posted 22 April 1996.
Martial arts
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Lineage of Mystaran Martial Arts by Giampaolo Agosta, from The Piazza posted 28 July 2020.
Canon references to martial arts by Giampaolo Agosta from the Mystara Message Board posted 18 December 2004.
Secret passes of the Ten Thousand Fists of the Khan by Giampaolo Agosta from the Mystara Mailing List posted 18 September 2004.
Diffusion and Development of Martial Arts in Mystara by Giampaolo Agosta from the Mystara Mailing List posted 9 September 2004.
Martial Arts Styles by Marco Dalmonte, from the Mystara Mailing List posted 18 August 2000.
Basic martial arts weapon mastery charts by redfish, from the Mystara Mailing List posted 30 April 1998.
Elemental Martial Arts by David Melik, from the Mystara Mailing List posted 29 March 1997.
Unarmed Combat Styles in D&D by George Hrabovsky, from the Mystara Mailing List posted 28 June 1996.
Aikido by Andrew Theisen, from the Mystara Mailing List posted 14 January 1996.
Swordsmanship
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5E Savage Coast Fighting Schools by Eric Anondson, from The Piazza posted 29 July 2020.
Secret Passes by Almadjian, from the Mystara Message Board posted 25 June 2002.
Darokinian Rapier and Main-Gauche Fighting feat for 3E by David S. Leland, from the Mystara Mailing List posted 15 September 2000.
Fighting Style: Karameikan Style by Beau Yarbrough, from the Mystara Mailing List posted 22 May 2000.
Swashbucklers & Firearms by Bruce Heard, from the AOL Savage Coast/Red Steel Message Board posted 25 August 1995.
En Garde!. An article on Savage Coast sword tactics by Cindi Rice, from Dragon Magazine 232 published August 1996.
Warfare and mass combat
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War Machine and making levels matter by Anarion_Elendili, from The Piazza posted 6 July 2023.
Creating Your Own Regiments of Renown by ViktorD20, from The Piazza posted 17 March 2021.
Military unit symbols incorporating Warmachine bonus indicators by Greg Weatherup, current as of 29 June 2019.
Naval Combat by Donald Eric Kesler, current as of 12 March 2009.
War Machine in 3E by Jamie Baty from the Mystara Message Board last updated 7 September 2006.
War Machine options by Jamie Baty from the Mystara Message Board last updated 14 July 2005.
War Machine modifications for X10 by Ville V Lähde, current as of 10 September 2001.
MyMiCS: Mystaran Mass Combat System by Adrian Matthias, from Tome of Mystara issue 5 dated 2 October 2000.
Mystaran Mass Combat System by Adrian Mattias and James Ruhland, from the Mystara Message Board posted 26 April 2000.
Formation Fighting by Rob, from the Mystara Mailing List posted 3 February 2000.
Known World Grimoire: Assembling Armies in the D&D Known World by Bruce Heard, from Dragon Magazine 191 published March 1993.
Equipment and Treasure
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DM Screen element: Arms and Equipment Sheet by Eric Forster, from the D&D BECMI Facebook group posted 7 July 2024.
Cyclopaedia Compendium volume 2 - an unofficial DM's supplement for classic D&D and OSR games by Cab Davidson, from The Piazza posted 13 December 2023.
Legacies of Ill-Gotten Loot by Bruce Heard, from About Bruce Heard and New Stories dated 22 August 2023.
Random Gemstone Determination by Cab Davidson, from The Piazza posted 7 May 2021.
Equipment Saving Throw table by Robin from Breath of Mystara 22 September 2013.
Pricing
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Potion Costs by Cab Davidson, from The Piazza posted 13 October 2023.
A fresh perspective on the RC crafting cost formulas by Hightechartist, from The Piazza posted 2 May 2021.
Some thoughts on The Price of Magic Items by barna10 from The Piazza posted 19 December 2020.
The Costs of Weapons and Armour by Fabrizio Nuzzaci, current as of 13 September 2020.
D&D: How Much for that Sword? by Bruce Heard, from About Bruce Heard and New Stories dated 18 June 2020.
What can be Bought by Robin from The Piazza posted 27 August 2015.
Linking prices with the game world by Bruce Heard, from About Bruce Heard and New Stories dated 21 May 2012.
Radu's Emporium by Sean Meaney, from The Piazza posted 21 January 2010.
Price List by Ville Lähde current as of 20 May 2003.
New scheme for item prices by Pasi Anias, from the Mystara Mailing List posted 26 February 1997.
Weaponry and Armour
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Cyclopedia Companion - an unofficial players supplement for classic D&D and OSR games by Cab Davidson, from The Piazza posted 20 May 2024.
Gunpowder on Mystara by Robin, current as of 29 August 2022.
Armeria di Mystara: Guida ad armature, scudi, armi bianche, da fuoco e d’assedio (Italian), v 1.78 dated 30 April 2021 by Marco Dalmonte current as of 9 November 2021; English translation version 1.6 by Gary Davies, current as of 16 December 2015.
Known World Firearms by Matthew Fenn, current as of 11 August 2021.
Exotic Materials for Weapons and Armour by Cab Davidson, from The Piazza posted 4 May 2021.
Additional Exotic Materials for Weapons and Armour by Robin, from The Piazza posted 27 April 2021.
Chariots and Charioteering by Håvard, from The Piazza posted 1 September 2019.
Armor House Rules by Håvard from The Piazza posted 30 October 2016.
Revised Bow Rules by Håvard from The Piazza posted 29 October 2016.
Weapon Materials: Rankings by Giampaolo Agosta, from The Piazza posted 18 April 2012.
Weapon Materials: Elemental Materials by Håvard, from The Piazza posted 16 April 2012.
Gunpowder in Mystara by Pol Ginés, from The Piazza posted 12 July 2009.
New Weapon System by Angelo Bertolli current as of 22 June 2001.
Equipment Weights and Weapon Damage for Wee Folk by Geoff Gander, current as of 10 July 1998.
Crossbows and Guns by Kenneth Baggaley from the AOL Savage Coast/Red Steel Message Board posted 2 November 1996.
Magic items
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Cyclopedia Companion - an unofficial players supplement for classic D&D and OSR games by Cab Davidson, from The Piazza posted 20 May 2024.
Cost of Magical Items (particularly potions and scrolls) by Anarion_Elendili, from The Piazza posted 8 October 2023.
Magic Items Random Generation Table by Cab Davidson, from The Piazza posted 9 February 2023.
Thoughts about the Bag of Holding by Robin, from The Piazza posted 23 December 2022.
Revised Magic Item Tables by Cab Davidson, from The Piazza posted 23 October 2021.
Some thoughts on the Rod of Inertia and the Rod of Cancellation by Robin, from The Piazza posted 29 August 2021.
Honey and Magical Honey by Robin, from The Piazza posted 11 March 2021.
Cost of Healing: Potion and Honey by Aoz, from The Piazza posted 9 March 2021.
Rules for using crystal balls by Robin, from The Piazza posted 13 March 2021.
Bug Juice Alchemy by Aoz, from The Piazza posted 11 February 2021.
Cost to enchant items by Alessio Sbarbaro, from the BECMI Facebook group posted 11 September 2020.
Alchemical vs Magical Potions by Giampaolo Agosta, from The Piazza posted 17 March 2020.
Potion Guide by Robin, from The Piazza posted 15 February 2018.
Naming magic items by JTrithen, from The Piazza posted 20 September 2010.
Magic Item Tables by Angelo Bertolli current as of 6 June 2001.
Characters
Ability scores
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Thoughts on what powers clerical powers by LoZompatore, from The Piazza posted 23 October 2023.
Improving Ability Scores by Craig Antoun from The Piazza posted 16 January 2021.
Ability Score House Rules by TheNewPippinStrano, from The Piazza posted 13 November 2020.
Improving Ability Scores by Bruce Heard, from About Bruce Heard and New Stories dated 27 August 2018.
Appearance and Comeliness by Scott Moore, current as of 28 March 2004.
OD&D Ability Score Adjustments by Jim Bobb, current as of 5 March 1999.
AD&D Revised Strength Table by Jim Bobb, from the Mystara Mailing List posted 29 January 1999.
AD&D Revised Intelligence Table by Jim Bobb, from the Mystara Mailing List posted 29 January 1999.
A way to increase Ability Scores by Martin Johansen, from the Mystara Mailing List posted 22 July 1997.
Alignment
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Converting alignments to BECMI by Håvard from The Piazza posted 13 February 2023.
Alignment by Eric Stoneburner, current as of 17 February 2020.
Mystara Character Alignment by Charles Rose, from the Mystara Reborn Facebook group posted 12 December 2019.
Dynamic Alignment System by Håvard from The Piazza posted 7 November 2016.
Sphere Alignment System by Charles Taylor, from The Piazza posted 23 March 2013.
Unified Sphere Theory by Charles Taylor, from The Piazza posted 19 March 2013.
Sphere Alignment System and GAZ7 personality traits by Charles Taylor, from The Piazza posted 17 March 2013.
Other thoughts on Immortal Spheres as Alignments and more! by Greg Weatherup, from The Piazza posted 6 March 2013.
FRPG Personal Code: an Alignment Alternative by Jenni A. M. Merrifield, from the Mystara Mailing List posted 12 November 1999.
New Rules for Alignment by Marco Dalmonte, from the Mystara Mailing List posted 31 January 1998.
Characters
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Character Creation Sheet by Eric Forster, from the D&D BECMI Facebook group posted 4 July 2024.
BECMI High Level Planar Adventure Class/Race Rules by Håvard from The Piazza posted 3 October 2023.
Turn Undead: now with a smoother curve by Anarion_Elendili, from The Piazza posted 31 August 2023.
Turn Undead modification by greatleapingcrab, from The Piazza posted 10 August 2023.
Alternate undead turning mechanic by Cab Davidson, from The Piazza posted 9 August 2023.
Turn Undead: now with a smoother curve by Anarion_Elendili, from The Piazza posted 9 August 2023.
Strengthening low level mages by Parzival, from The Piazza posted 22 July 2023.
Cantrips and more versatile spell memorization by Anarion_Elendili, from The Piazza posted 13 July 2023.
Cantrips and Spell casting by Erik, from The Piazza posted 12 July 2023.
Separating Class and Race in Classic D&D by Justin Pfeil, from The Piazza posted 31 August 2022.
Separating Class and Race in Classic D&D: the Rutwyr (Dwarf Thief) and the Elf Rogue by Parzival, from The Piazza posted 30 July 2022.
Separating Class and Race in Classic D&D by Cab Davidson, from The Piazza posted 26 July 2022.
Separating Class and Race in Classic D&D by Håvard from The Piazza posted 26 July 2022.
Compilation of Character Creation by Robin, from The Piazza posted 30 January 2022.
House rules for new characters by Shesheyan, from The Piazza posted 3 July 2020.
Thoughts on a spell-point system by paladinn, from The Piazza posted 9 June 2020.
[B/X] Thief Update by Shesheyan, from The Piazza posted 30 May 2019.
[B/X] Magic-User and Cleric Update by Shesheyan, from The Piazza posted 30 May 2019.
[B/X] Fighter Class Update by Shesheyan, from The Piazza posted 30 May 2019.
Revised Class Specifications for Nithian characters by Håvard from The Piazza posted 22 October 2016.
Playing OD&D with Mentzer rules by Antonio Eleuteri from The Piazza posted 17 December 2010.
BECMI class options by Antonio Eleuteri from The Piazza posted 29 November 2010.
Clerical Domains and Specialist Magic Users by Blacky the Blackball from the Piazza posted 18 October 2010.
OD&D-style race/class combination by Roger LV Girtman II, from The Piazza posted 10 August 2010.
OD&D-style race/class combination by Antonio Eleuteri from The Piazza posted 6 August 2010.
3.5/3.75 Race and Class Options by Giorgio from The Piazza posted 5 August 2010.
Advanced Character Options by Antonio Eleuteri from The Piazza posted 26 February 2010.
Multiclassing by Cab Davidson, from The Piazza posted 26 August 2009.
Alternate Race and Class mechanics by Cab Davidson, from The Piazza posted 21 August 2009.
PC's families (random determination) by Akiyama, from the Mystara Message Board posted 16 August 2007.
Meta-classes by Sean Meaney, from the Mystara Message Board posted 2 June 2007.
Known World Regions by Andrew Theisen from the Mystara Message Board posted 11 December 2006.
Reconciling immortals by Scott Moore, current as of 26 July 2005.
A more swashbuckling Rake house rules for different character classes by Joe Mason from the Mystara Mailing List posted 26 February 2005.
Demihuman races in basic D&D by Joe Mason from the Mystara Mailing List posted 26 February 2005.
Epic Levels in OD&D by Scott Moore, current as of 28 March 2004.
Multi-classing OD&D characters by Jim Bobb, current as of 7 June 1999.
Class Switching ideas by David Knott, from the Mystara Mailing List posted 22 June 1998.
Experience
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Experience Points: Beyond Getting Experience from Killing Monsters by Keith Byers, from the BECMI Facebook group posted 31 March 2023.
Experience Recalculator version 4 by Bruce Heard, from the BECMI Facebook group posted 26 April 2021.
D&D BECMI Alternate Experience Levels by Bruce Heard, from About Bruce Heard and New Stories dated 22 April 2021.
Mastery
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Mastery Training for Everything by Charles Taylor, from The Piazza posted 10 December 2012.
Monster Mastery by JJJ, from the Mystara Mailing List posted 12 December 2002.
Mastery and Training by Phillip Jones, from the Mystara Mailing List posted 21 August 2002.
Psionics
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George’s Pathfinder Mystara Campaign: Psionics by Giorgio from The Piazza posted 21 April 2010.
Saving Throws
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Alternate Saving Throw system by Ray Allen, from The Piazza posted 5 February 2023.
D&D BECMI Alternate Saving Throws Pt. II by Bruce Heard, from About Bruce Heard and New Stories dated 6 April 2021.
D&D BECMI Alternate Saving Throws by Bruce Heard, from About Bruce Heard and New Stories dated 5 April 2021.
Single save mechanic by paladinn, from The Piazza posted 11 April 2021.
Alternate Magic User Saving Throw Progression by David Keyser, from The Piazza posted 6 July 2020.
Alternate Uses for Saving Throws by Håvard, from The Piazza posted 23 November 2015.
Alternative Saving Throws by Scott Anderson, from The Piazza posted 16 April 2014.
Saving Throws variant by Giampaolo Agosta, from The Piazza posted 31 August 2009.
Saving Throws variant by Antonio Eleuteri from The Piazza posted 23 August 2009.
Skills
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General Skills: 1 Point per level, Changed costs by Håvard from The Piazza posted 3 October 2024. NEW
Alternative General Skills System - Deminhumans by Parzival, from The Piazza posted 18 January 2024.
Alternative General Skills System by Parzival, from The Piazza posted 13 January 2024.
RC General Skills Revised List by Anarion_Elendili, from The Piazza posted 15 July 2023.
A house-rule idea for Skills by Anarion_Elendili, from The Piazza posted 6 July 2023.
General skills by LibraryOgre, from The Piazza posted 25 May 2023.
Expansion to the general skill rules by Håvard, from The Piazza posted 24 May 2023.
Druids and Shamans by Håvard, from The Piazza posted 1 January 2023.
Special Skills: A New Category for the General Skill Rules for BECMI/RC by Håvard, from The Piazza posted 1 January 2023.
Fixes for Weapon Mastery Skill by Håvard, from The Piazza posted 30 December 2022.
Skill Levels for Foreign and Related Languages by Giampaolo Agosta, from The Piazza posted 5 January 2022.
Climb Walls by Robin, from Deviant Art last updated 3 January 2022.
Thoughts about revamped skill system by Andrew Theisen from The Piazza posted 1 January 2022.
Manuale delle Abilità Generali (Italian), v 8.8 by Marco Dalmonte current as of 9 November 2021.
Weapon Mastery blended into General Skills by Robert J. Nuttman, Jr., from The Piazza posted 16 November 2020.
Feint by Craig Antoun from The Piazza posted 9 September 2020.
[Heroes & Horrors] Skill/ Proficiency system by paladinn, from The Piazza posted 29 June 2020.
An alternate take on Bargaining by The Dark from The Piazza posted 9 June 2020.
Extended Rules Cyclopaedia Skills List by Cab Davidson, from Thoughtful Nerd posted 12 May 2020.
Using the Alchemy Skill to create potions (House Rule) by Håvard from The Piazza posted 19 March 2020.
Special skills taught at the Great School of Magic in Detail by Robin, from The Piazza posted 25 November 2018.
Revisiting BECMI skills by Bruce Heard, from About Bruce Heard and New Stories dated 26 September 2018.
Compilation of Skills by Robin, current as of 5 August 2018.
Classic D&D Skills: A d% System by Håvard and Brian Mathers, from The Piazza posted 10 July 2017.
Alternate Skill Mechanics by Håvard, from The Piazza posted 7 July 2017.
RC General Skills Revised List by Håvard, from The Piazza posted 19 June 2017.
Martial oriented work Stations by Håvard, from The Piazza posted 26 December 2014.
Skills: Work Stations by Håvard, from The Piazza posted 13 January 2014.
Talents by Antonio Eleuteri from The Piazza posted 25 August 2009.
Revision Of The General Skills System OD&D by Giampaolo Agosta, from The Piazza posted 8 September 2008.
Skill Mastery System by George Hrabovsky, from the Mystara Mailing List posted 13 June 2006.
Skills and the fighter by Cab Davidson, from the Mystara Mailing List posted 5 February 2004.
Skills by Pasi Anias, from the Mystara Mailing List posted 8 May 2000.
Research by Geoff Gander, from the Mystara Mailing List posted 14 September 1999.
A new system for proficiencies by Meltheim Shadowstalker, from the Mystara Mailing List posted 10 September 1999.
Cabal Skill by John Hare, from the Mystara Message Board posted 7 April 1999.
Prestidigitation by Jim Bobb, from the Mystara Mailing List posted 19 December 1998.
The Outer Being Lore by Geoff Gander, from the Mystara Message Board posted 8 December 1998.
Modrigswerg skills by John Hare, from the Mystara Message Board posted 4 August 1998.
Skills Index by Pasi Anias and Mischa E Gelman, from the Mystara Mailing List posted 11 July 1998.
Wand Mastery by John Hare, from the Mystara Message Board posted 7 July 1998.
A New Idea for Skills by Geoff Gander, from the Mystara Mailing List posted 19 January 1998.
Proficiencies by Matthew Levy, from the Mystara Mailing List posted 31 May 1996.
Weapon mastery
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Garrotte by fisaidaid, from The Piazza posted 11 August 2024.
Revised weapon mastery rules and charts by Lance Duncan, from The Piazza posted 28 June 2024.
Cyclopedia Companion - an unofficial players supplement for classic D&D and OSR games by Cab Davidson, from The Piazza posted 20 May 2024.
Cyclopaedia Compendium volume 2 - an unofficial DM's supplement for classic D&D and OSR games by Cab Davidson, from The Piazza posted 13 December 2023.
Thoughts on weapon mastery by paladinn, from The Piazza posted 20 September 2023.
Simple Weapon Mastery (House-rule) by Anarion_Elendili, from The Piazza posted 18 August 2023.
Weapon Mastery with natural weapons by Brian Rubinfeld, from The Piazza posted 2 August 2023.
Deflect by Håvard, from The Piazza posted 8 July 2023.
Reformatted Weapon Mastery Sheets by LibraryOgre, from The Piazza posted 12 May 2023.
Weapon Mastery and Firearms by Cab Davidson, from The Piazza posted 5 May 2023.
Arbalest (War Crossbow) by Galdor, from The Piazza posted 24 July 2022.
Giant Catapult by Galdor, from The Piazza posted 17 July 2022.
Hunting Blowgun by Cab Davidson, from The Piazza posted 19 January 2022.
Spiked Plumbata by Galdor, from The Piazza posted 13 October 2021.
Urmuni by Cab Davidson, from The Piazza posted 2 October 2021.
Urmuni by Galdor, from The Piazza posted 28 September 2021.
Sledgehammer by Galdor, from The Piazza posted 7 September 2021.
Kpinga by Cab Davidson, from The Piazza posted 27 August 2021.
Kpinga by Galdor, from The Piazza posted 25 August 2021.
Bearded Axe by Galdor, from The Piazza posted 18 August 2021.
Scepter by Galdor, from The Piazza posted 10 August 2021.
Hooked Sword by Galdor, from The Piazza posted 5 August 2021.
Sling Staff by Galdor, from The Piazza posted 26 July 2021.
Bastard Axe by Galdor, from The Piazza posted 20 July 2021.
Sword Staff by Galdor, from The Piazza posted 12 July 2021.
Plumbata by Cab Davidson, from The Piazza posted 10 July 2021.
Plumbata by Galdor, from The Piazza posted 5 July 2021.
Billy Club by Cab Davidson, from The Piazza posted 1 July 2021.
Billy Club by Galdor, from The Piazza posted 1 July 2021.
Weapon Mastery - New Weapons by Cab Davidson, from Thoughtful Nerd posted 25 October 2018 updated from The Piazza posted 4 May 2021.
[BECMI] Weapon Mastery revamp by Andrew Theisen, from The Piazza posted 13 June 2020.
Simpler Weapon Mastery by Håvard from The Piazza posted 6 January 2020.
Weapon Mastery and Similar Weapons by Cab Davidson, from Thoughtful Nerd posted 24 October 2018.
Magical Weapon Mastery by Cab Davidson, from Thoughtful Nerd posted 10 October 2018.
Deflect by Craig Antoun from The Piazza posted 18 January 2016.
BECMI: Alternate Weapon Mastery Rules by Håvard from The Piazza posted 24 February 2015.
The Weapon Mastery Pyramid by Sheldon Morris from The Piazza posted 24 June 2011.
Weapon Mastery Level Limits by Blacky the Blackball from The Piazza posted 24 June 2011.
The Weapon Mastery Pyramid by Joe Not Charles, from The Piazza posted 22 June 2011.
Flintlock Weapons by Donald Eric Kesler, current as of 26 February 2009.
Thompson Sub Machine Gun M1928A1 by Donald Eric Kesler, current as of 14 April 2008.
Weapon Mastery and Class Balance in OD&D by Dan Eustace, from the Mystara Mailing List posted 20 August 2002.
Flails and Morningstars weapon mastery by Geoff Gander, from the Mystara Mailing List posted 8 August 2000.
Ur-Carnifex Bow weapon mastery by Geoff Gander, from the Mystara Message Board posted 12 April 1999.
Basic martial arts weapon mastery charts by redfish, from the Mystara Mailing List posted 30 April 1998.
Weapon Mastery for AD&D by Ron Murphy, from the Mystara Mailing List posted 30 April 1998.
A weapon mastery system v2.0 by David Melik, from the Mystara Mailing List posted 30 April 1996.
Game conversions
Converting between different editions of D&D
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Warlock in Mystara: Eternal Proxy by Marc Saindon, from the Mystara Facebook group posted 25 June 2024.
Converting alignments to BECMI by Håvard from The Piazza posted 13 February 2023.
3.5e qualifications to be a member of the Thousand Wizards of Alphatia by redking, from The Piazza posted 10 December 2021.
Reconciling 3.5 deity ranks with immortal ranks using mathematics by redking, from The Piazza posted 4 December 2021.
The Immortals are Explorers, and an immortal-deity level comparison by Håvard from The Piazza posted 25 October 2021.
Converting treasure types between BECMI and 2E by Andrew Theisen from The Piazza posted 16 September 2021.
Converting morale between BECMI and 2E by Andrew Theisen from The Piazza posted 16 September 2021.
Mystara: Player's Guide, 5E conversion by Glen Welch.
[5E] Using Ravnica in BC 2300 by John Calvin, from The Piazza posted 21 December 2020.
Converting BECMI to 5E levels by WingofCoot, from The Piazza posted 30 June 2020.
[5E] Reimagining some Gaz8 Concepts by Håvard from The Piazza posted 16 February 2020.
BECMI to 1st Ed Level Conversion by Bruce Heard, from The World of Calidar Chat group posted 5 November 2019.
5E Humanoids by JTrithen, from The Piazza posted 6 October 2019.
Demigods by Karl David Brown from The Piazza posted 16 April 2019.
Demigods by argentmantle from The Piazza posted 10 April 2019.
Demigods by Glen Welch, from The Piazza posted 9 April 2019.
Converting a Karameikos Campaign to 5E by Håvard from The Piazza posted 17 March 2019.
The Afterwrath Mystara Campaign Handbook by pawsplay from The Piazza posted 12 March 2019.
Some thoughts about Mystaran races and classes in 5E by Håvard from The Piazza posted 11 March 2019.
4E races in Mystara by Håvard from The Piazza posted 26 December 2018.
Thoughts about Mystara 5E by Sean Meaney, from Reddit posted 7 March 2018.
Mystara 5E thoughts by Stefan Beate, from The Piazza posted 21 November 2017.
NPC Level Conversion BECMI to 5e by Stefan Beate, from The Piazza posted 17 June 2017.
BECMI to 5E elf conversion thoughts by Stefan Beate, from The Piazza posted 12 May 2017.
BECMI to 5E character levels by class by Mike Harvey, from The Piazza posted 11 May 2017.
BECMI to 5E cleric conversion thoughts by Stefan Beate, from The Piazza posted 10 May 2017.
BECMI to 5E character levels including spell levels by Sheldon Morris from The Piazza posted 10 May 2017.
Thoughts on Converting from 1E to BECMI or B/X by Håvard and Giampaolo Agosta, from The Piazza posted 9 August 2017.
NPC conversion BECMI to 5e by Håvard from The Piazza posted 3 January 2017.
5E Rakasta by JTrithen, from The Piazza posted 23 November 2016.
5E Races for Mystara by DJ Hartel, from The Piazza posted 18 November 2016.
System for Converting Rules Cyclopedia Monsters to 5E by Sheldon Morris from The Piazza posted 26 June 2016.
5E Background Information Specific to GAZ1 by Miladoon from The Piazza posted 9 December 2015.
5E Mystara Domains by Urieal from The Piazza posted 28 April 2015.
Ideas for 5E domains by sphere by Antonio Eleuteri from The Piazza posted 14 January 2015.
5E classes for Mystara by Håvard, from The Piazza posted 8 January 2015.
Customised 5e Glantri Campaign Part 4: Humans by Caius of Glantri, from The Piazza posted 11 November 2014.
Mystara 5e Customised Glantri: Gnomes by Caius of Glantri, from The Piazza posted 9 November 2014.
Customised 5e Glantri Part 3: Halflings by Caius of Glantri, from The Piazza posted 1 November 2014.
Mystara (5e Glantri Campaign): Duels by Caius of Glantri, from The Piazza posted 1 November 2014.
Customised 5e Glantri Campaign Part 1: Dwarves by Caius of Glantri, from The Piazza posted 1 November 2014.
Customised 5e Glantri Campaign Part 6: Rebels by Caius of Glantri, from The Piazza posted 24 October 2014.
Customised 5e Glantri Campaign Part 5: Students by Caius of Glantri, from The Piazza posted 19 October 2014.
Customised 5e Glantri Campaign Part 2: Elves by Caius of Glantri, from The Piazza posted 19 October 2014.
Races and Monsters, 5E Style by Blacky the Blackball from the Piazza posted 22 September 2014.
Immortals, 5E Style by Blacky the Blackball from the Piazza posted 25 July 2014.
Mystara Fourth Edition from The Piazza last file posted 27 July 2011.
M4E in Mystara by Ashtagon, from The Piazza posted 27 August 2009.
PHB2 for Mystara by Rodger Burns, from The Piazza posted 23 August 2009.
HR supplement Mighty Fortress in the Savage Coast by Andrew Theisen, from The Piazza posted 7 August 2009.
Converting BECMI's 36 levels to 30 by Joe Not Charles, from The Piazza posted 31 July 2009.
3E Quick And Dirty Conversion by Håvard, from The Piazza posted 18 December 2008.
4E Quick And Dirty Conversion by Håvard, from The Piazza posted 17 December 2008.
4E classes in OD&D: Warlock by Giampaolo Agosta, from The Piazza posted 16 November 2008.
Immortal God equivalency by region by Giampaolo Agosta, from The Piazza posted 9 July 2008.
Mystaran Immortal equivalents of 4E Gods by Joe Not Charles, from The Piazza posted 8 July 2008.
Mystara 3E Conversion Project by Roger LV Girtman II, from The Piazza posted 6 July 2008.
Monster Manual 5 - Mystaran Adaptation by Ohad Shaham from the Mystara Mailing List posted 4 August 2007.
Mystara Campaign Book: The Mystara Newbie Guide and A Mystara AD&D 2e Conversion by Giampaolo Agosta and The Mystara Newbie Guide Group, current as of 5 March 2006.
Hollow World 3.5 race conversions by Gary Davies from the Mystara Mailing List posted 4 March 2005.
OD&D to 3E conversion of characters by Andrew Theisen, from the Mystara Message Board posted 3 May 2004.
Converting monsters to the 3rd edition rules system by Trevor Mellis, current as of 10 July 2001.
D&D to AD&D Conversion Notes by Ian R Malcomson, from the frp newsgroup July 1998.
Adapting AD&D to Mystara by Håvard, from the Mystara Mailing List posted 11 March 1998.
Converting from other systems
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Icons for Mystara by Giampaolo Agosta, from Threshold Magazine issue 22 dated 6 March 2019.