Tiamat, Test of Time (3.5e Deity)
From D&D Wiki
Also compare "Deities and Demigods" Page 93 for WotC official version, found in Draconomican as well.
Mother of scales, Dragon's wrath, Fury of nature...
|Portfolio:||Evil dragons, conquerors|
|Clergy Alignments:||NE, LE|
|Domains:||Destruction, Evil, Law, Trickery|
Tiamat (tee-ah-mat) is revered as a deity in many locales. Her rival is Bahamut, against whom she constantly strives. Evil dragons, especially the blue and green varieties, pay homage to her, while good dragons avoid her. Her natural form is a thick-bodied dragon with five heads and a wyvern's tail. Each head has a different color: white, black, red, blue, and green. The color of each head continues down her massive body. Tiamat has numerous consorts, especially those of the chromatic kind.
Tiamat believes in the spreading of power of herself and dragons, however she also wishes to be worshiped by other races as well as she believes her place is as ruler over all the gods and all the people, as dragons are most definately the most worthy race to do this. She also wishes for her followers to work towards the death of good aligned dragons and worhipers of any deities of good in general.
 Cults and Temples
Cults worshiping Tiamat are increasingly rare nowadays, since she is a long forgotten Goddess. Still, sometimes, groups of fanatics happen to find old tomes filled with ancestral knowledge teaching of Tiamat and of the destruction she brought upon the world. When a temple dedicated to Tiamat is constructed, it usually consists of a cavern deep within the earth with a giant dragon head with its mouth wide open, which is used for sacrifices. It is believed that during a sacrificial ritual for Tiamat, the greater the fear experienced by the victims, the greater the blessing bestowed by the Goddess.