The platinum dragon is one that I introduced as a messenger, an NPC relaying information to PC's from Diamond. I've used it a handfull of times, but the concept is sound, I think.
Dragon, Platinum (Quartz)
by Cab Davidson
| Stat | Small | Large | Huge |
| AC: | -0 | -2 | -4 |
| HD: | 8** | 12*** | 16**** |
| Move: | As Green Dragon | As Green Dragon | As Green Dragon |
| Attacks: | As Green Dragon | As Green Dragon | As Green Dragon |
| Damage: | As Green Dragon | As Green Dragon | As Green Dragon |
| No. Appearing: | 1 | 1 | 1 |
| Save As: | F8 | F24 | F36 |
| Morale: | 8 | 10 | 11 |
| Treasure Type: | H | Hx2,I | Hx3,Ix2 |
| Intelligence: | 9 | 12 | 15 |
| Alignmnent: | Lawful (Platinum) Chaotic (Quartz) | ||
| XP Value: | 2300 | 4750 | 7350 |
| Spells | ||||||
| Levels | 1 | 2 | 3 | 4 | 5 | 6 |
| Small | 3 | 3 | 2 | 1 | ||
| Medium | 4 | 4 | 3 | 2 | 1 | |
| Large | 5 | 4 | 4 | 3 | 2 | 1 |
Breath, Platinum : Light beam, dimensions as per blue dragon
Breath, Quartz: Light beam, dimensions as per blue dragon, + ageing 10-40 years
Platinum dragons are the messengers of Diamond, the ruler of all Lawful dragons, and are rarely found on the prime plane. Typically one or two are found in the Wyrmsteeth range at any one time, where they act as representatives of Lawful dragons at the court of the Draconic Monarch. They can polymorph at will, as a gold dragon can, and often spend time in forms that are useful for gathering information and avoiding direct conflict. They are not combative by nature, and will typically use their considerable magical talents to misdirect or deter a foe rather than to fight. They are naturally cautious, but curious individuals. Platinum dragons appear to be almost impossibly reflective, reflecting any light present such that anyone attacking a platinum dragon visualising them by any means but infravision is at -2 to hit.
Quartz dragons are if even rarer, and likewise take on the role of messengers for their immortal ruler, Pearl (who rarely engages in diplomacy and has few messages to send - hence the rareness of quartz dragons). They are temperamentally quite the opposite of platinum dragons, relishing in cruelly destroying foes, usually using their magical might to lure targets into traps. Their crystalline platinum skin gives it the same defensive advantage as platinum dragons.
Platinum dragons breath a beam of pure white light energy. Quartz dragons likewise breath a burning beam of light, but victims failing a saving throw will suffer 10-40 years of ageing.