Tiamat, the Tyrant

Tiamat, the Tyrant is a member of The Fallen representing Conquest, Greed, Oppression, and Tyranny. She is most commonly portrayed as a chromatic dragon with 5 heads, white, black, blue, green, and red. She is the patron and god of most chromatic dragons. Her symbol is a 5 headed dragon. She dwells in the plane of Gehenna, always scheming of a way to break free.
Tiamat's archenemy is Bahamut, the Platinum Dragon.

Evil clerics who are dedicated to Order, Tempest, or Trickery can serve Tiamat.