Tiamat

Tiamat, Queen of the Chromatic Dragons, and about to fuck your shit up.

Tiamat, also known as the Polychromatic Dragon and the Mother of Dragonkind, is the goddess of Chromatic Dragons in Dungeons and Dragons, and was a centerpiece of the lore until 4E fucked everything up.

Genesis

She was created alongside her "brother" Bahamut when the Primordial Erek-Hus slew Io, the father of Dragons. Rising from the corpse of her "father", she and Bahamut destroyed the Primordial, before turning on each other. Where Bahamut represents the nobility and sense of justice his father had, Tiamat represents his other characteristics: avarice, pride, arrogance, and the raw power to get away with it. Unlike her one-headed brother and two-headed father, Tiamat has five heads, 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.

Domain

She is a vain, greedy, lustful and arrogant goddess, expressing what would be extreme hubris if she wasn't already a god. Though she is a paragon of dragon strengths, she shows few of their weaknesses; she is not impatient, nor overconfident (when dealing with other gods). Her primary concern is the propagation and well-being of chromatic dragons as a whole, ensuring her children become owners of the world. She believes this goal necessarily requires overthrowing the rule of Bahamut and establishing supremacy over metallic dragonkind. Like Anonymous, Tiamat never forgets and does not forgive. 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.

Dwelling

Tiamat lives in the astral domain of Tytherion, a realm shared with Zehir. Her realm is Azharul, located in ravines and hewn out in the rock of Tytherion. Why the goddess of dragons lives underground and the lord of serpents in the highest reaches of the domain is the story of how Tiamat set up her realm. After her defeat at the hands of Bahamut, Tiamat took a liking to Tytherion and set up shop there, chasing Zehir's followers to their bastions and temples, large buildings build above ground, leaving Tiamat with the rest. Though they wage no open war, Tiamat is constantly scheming against Zehir, planning on claiming the domain for herself one day.

Tiamat's humanoid form.

Servants

Tiamat's first and foremost servants are the chromatic dragons. About 95% of them serve their goddess in some way. Those who prefer a different deity have a grim fate waiting for them: in the depths of her lair behind a pair of 100' adamantine doors Tiamat has a collection of the souls of those chromatics sworn to other deities, locked up for eternity. Aside from the chromatics, Tiamat counts a notable number of humanoids amongst her servants, mainly Dragonborn and other part-dragons, and Humans. 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.

Another thing of note is that Tiamat "likes" to "give audience" to mortals in her "inner sanctum". In other words, Tiamat likes her some non-divine dick. Most of the time this means she fucks a chromatic that impressed her, but she's also known to have courted catastrophic, metallic, planar and scourge dragons. Amongst her current fuckbuddies is a Dragonborn, though it's not mentioned if she takes her human shape before having sex with humanoids.

With kung-fu action grip

Depictions

• In Advanced Dungeons & Dragons, Tiamat first appears as a unique boss-monster in the Greyhawk setting. Later, she has the first layer of the Nine Hells assigned to her as her 'home plane,' giving her Outsider status and the ability to avoid permanent death.
• 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.
• In the Dragonlance setting, the goddess of evil stuff "Takhisis" uses a Tiamat form as her avatar. She is opposed by a god of good stuff "Paladine" who uses Bahamut as his avatar. Between them as moderator is "Gilean," with a librarian avatar. The evil and good gods agree to a 'hands-off' policy, and withdraw their dragons from the world at large, until Tiamat/Takhisis finds a loophole a couple years before the story starts.
• In AD&D 2nd edition, the Forgotten Realms campaign setting has a religion dedicated to her.
• In D&D 3rd edition, she's pretty much still the same, though she favors her natural, five-headed form.
• In D&D 4th edition, she is no longer considered a unique type of dragon, but always referred to as a goddess who happens to have a draconic primary avatar.