Demogorgon
by Marco Dalmonte(Angrboda, Goron, Gullveig, The Bane of Souls, The Dark Lady, The Lizard King)
Patron of Necromancy, Patroness of Corruption and Diseases, Patroness of Witchery
(Note: Demogorgon has two personalities, male and female, that co-exist in the same soul and body)
Level, Alignment, Sphere: 30 (Eternal), CE, Entropy
Symbol: a black pentacle on red field
Portfolio: necromancy, witchery, diseases, corruption, destruction, lizardkin and reptiles
Worshipped in: Savage Coast (Ator), Davania (Addakia, Jungle Coast, Izonda, Meghales Amosses), Hollow World (Malpheggi), Known World (Cynidicea, Darokin, Northern Reaches), Norwold
Appearance: a 18' high creature with two monkey's heads atop a pair of wiry necks, two long tentacles instead of arms, with scaly torso and legs, a long forked tail and a brown spinal crest.
History: LIKELY THEORY: Demogorgon's background is shrouded in mystery like that of the most ancient immortals. Some says she's a force of nature like Thanatos and Hel, the embodiment of evil of the sphere of Entropy. Other rumours say she was a reptile being (maybe a carnifex) that reached immortality under Thanatos's sponsorship after corrupting her own race, cursing all her kin to extinction or exile out of Mystara before the coming of the human race.
What is known for sure is that she's been around way before the Great Rain of Fire, that she's got a liking in necromancy and witchery and all the reptile races, and that she's got a double soul and double aspect: as female she's patroness of corruption, deceit and witchery; as male, he's patron of necromancy and destruction.
During the IV century AC, Demogorgon devised a plot to spread the Entropic influence over the eastern part of Darokin, but thanks to the timely intervention of a bold group of servants of Valerias, Ixion and Maat her plot was thwarted. In the end, her Temple of Evil was assaulted and she got trapped there in her mortal ID along with her followers by powerful magics cast by good priests and artifacts. Nowadays after 700 years she's still trapped in that temple which lies in the southern area of the Orclands, and she waits there to be freed by some of her followers or some other unwary adventurer looking for the secret treasures of her temple.
Personality: Despite her detention, she has always been able to grant her followers their power thanks to some immortal artifacts, and constantly sends her wail for help to her priests. They know they must find her to get the most important reward, but so far nobody has ever succeeded because of the powerful immortal spells that conceal her prison to scrying and divination attempts.
Demogorgon not only opposes the immortals of Law and Good, but she's in open competition with Orcus and Alphaks for the crown of Absolute Lord of Destruction. She considers her rivals too brutish and savage, devoid of the necessary malice and cunning useful to corrupt the mortal souls and bring the annihilation of the living beings to its completion. In her opinion, Alphaks and Orcus concentrate too much on the physical aspect of destruction, while she wants to break the mortals' soul too to do a perfect job.
Patron: unknown [likely: Thanatos]
Allies: sometimes collaborates with Thanatos and Nyx
Enemies: Ixion, Valerias, Maat, Ka, Diamond, Orcus, Alphaks
Classic D&D Stats:
Followers' alignment: Chaotic
Favoured weapons: flail and whip (allowed all bludgeoning weapons)
Clerics' skills & powers: clerics can inflict a non-mortal disease with touch once a week; power to control undead as Liege with HD equal to double cleric's level (max 40 HD); bonus +2 to general skills Necromancy and Demonology (not free)
Avengers' skills & powers: power to control undead as Liege with HD equal to avenger's level (max 20 HD); bonus +2 to any one of the following general skills: Necromancy or Demonology (not free)
D&D 3E stats:
Domains: Entropy, Chaos, Evil, Death, Corruption
Preferred weapon: heavy flail
Sources: Immortal set, WotI, SCS
As you may or may not have understood, I set up Demogorgon's current situation as Zuggtmoy from Temple of Elemental Evil, so you can use a modified version of the T1-4 in the Darokinian Orclands. I actually played it out and it was a lot of fun