Bahamut

Divinity

See also: Wyrm Princes of the Celestial Circle

AKA: the King of Good Dragons and Champion of True Order; the Platinum Lord
Portfolio: Good dragons; wisdom
Face of: Sovereign
Alignment: Lawful Good
Notable Worshipers: Good dragons
Symbol: Pole Star above a milky nebula
Home Plane: Mount Celestia
Known Proxies: Seven gold dragons

In his true form, Bahamut is a platinum dragon.

From On Hallowed Ground:

Bahamut is the protector of all good dragons and a fierce opponent of evil. He believes in the sanctity of all life, and won't willingly kill another creature unless he has no other choice. By dragon standards, he is sharing and selfless, and all good wyrms look to him for guidance and wisdom. Bahamut is also a friend to good-aligned mortal deities, especially the Seldarine and the Celts.

His realm is a palace filled with the jink he's accumulated over the years, and it somehow occupies the first four layers of Mount Celestial all at once. What's more, the case supposedly holds portals to the Astral and Elemental Planes. It's a real popular place, but it doesn't attract the right kind of attention.