Tiamat
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Tiamat, also known as the Polychromatic Dragon and the Mother of Dragonkind, is the goddess of Chromatic Dragons in the Dungeons and Dragons Greyhawk setting, and was a centerpiece of the lore until 4E fucked everything up. Her name is taken from Tiamat, a goddess in ancient Mesopotamian mythology who is substantially different (and does not have multiple heads). Arguably one of the most powerful [i]things[/i] in existence due to her incredibly power, her true form is that of a five-headed dark dragon of colossal size, with each head being of a different color (White, Black, Green, Blue, and Red). She has the abilities of all of the chromatic dragons, with each head able to use its associated breath weapon, on top of her immense physical size and a massive, sting-tipped tail, like that of a Wyvern. In the Dungeons and Dragons cartoon, she was powerful enough to kick the shit out of both the Dungeon Master and the Venger, the show's main antagonist, giving you a general grasp of how goddamned powerful she is. When she feels the need to deal with mortals, she typically assumes the form of an exquisitely beautiful dark-haired human sorceress.
A bitter enemy of Bahamut, Tiamat represents not only all that is greedy and rapacious about Dragonkind - she is a vain, greedy, and arrogant goddess, and one that has survived long enough to back up that arrogance with force. Though she exhibits their strengths, she shows few of their weaknesses. She is most concerned with propagating chromatic dragons, ensuring her children become successors to the world writ large, overthrowing the rule of Bahamut, and establishing supremacy over metallic dragonkind. Like /tg/, Tiamat never forgets a slight and virtually never forgives. Although she is not adverse to occasionally burning a village to the ground for the lulz, Tiamat is not exactly an up-front goddess; she is a long-term plotter and schemer, carefully manipulating others in Tzeentchian plots that are so subtle and so long-reaching that an enemy would likely find themselves unprepared even if they had foreknowledge of what she had planned years in advance, making her a deity of Just as planned.
The Queen of Chromatic Dragons demands reverence, homage, supplication, and tribute from her subjects. As a dragon, her hoard is believed to be worth trillions.