Bahamut

The Golden Guardian of Justice

Gold dragons are revered as the noblest and most powerful of all dragonkind. Their sun-bright golden scales, two elegant horns, and golden flame breath embody majesty itself. Eternally opposed to chromatic dragons, they hold justice, order, and protection of the weak as sacred duties. Capable of shapeshifting into humans or other races, they often walk among mortals incognito to support heroes from the shadows or live as mentors. They are the mightiest dragon mages, even commanding ancient time magic.

Primordial Sea Dragon of Mesopotamian Myth

Tiamat is the oldest dragon deity in human mythology, appearing in the 18th-century BCE Babylonian creation epic Enūma Eliš as the personification of primordial chaos and salt waters. With her consort Apsu (fresh waters), she existed before the cosmos and was mother to all gods. Enraged by the noise of younger gods, she led an army of eleven monstrous creatures into war against them. The storm-god Marduk slew her, splitting her body to form heaven and earth, with her tears becoming the Tigris and Euphrates rivers. In modern D&D, she is reinterpreted as the five-headed (red/white/black/blue/green) mother of the chromatic evil dragons.