Tiamat

Tiamat was the lawful evil goddess of greed, hate and storms. queen of dragons and along with her brother Bahamut, the eldest surviving member of the pantheon known as the Ogdoad.

Tiamat was also the eternal rival of her brother, who ruled over all good dragons. Locked in never-ending conflict with her sibling she plotted throughout history to ensure his demise.

Common titles afforded to her were The Avaricious, The Undying One and The Dark Lady.

Description
Tiamat was a unique chromatic dragon, who had one head for each primary colour of the most common species of chromatics, black, green, red, white and blue. Each head was able to operate entirely independently of each other and had the powers of a member of the respective race of dragonkind. Her body also had traits in common with a wyvern including a long tail tipped with a poisonous stinger.

She had two main avatars. The Dark Lady was a woman with long dark hair and completely black eyes. She always wore dark robes and frequently had a seductive smile on her face.

The Chromatic Dragon was a dragon with stubby legs and five heads that could be any combination of head belonging to a chromatic dragon, the skin of each merged into three stripes -- blue-green, gray and purple before they merged again into brown skin that covered her tail.

Personality
Tiamat was arrogant, greedy, hateful, spiteful and vain. She never forgave any kind of slight and was focused on obtaining more power and wealth. She disdained mortals, regarding them as mere disposable tools in her schemes. When needed, she was charming but her self-serving and reptilian personality betrayed her sooner or later.

She had an insatiable greed for treasures, but preferred that her followers brought it to her in the form of gifts instead of searching for riches on her own.

Powers
As a unique type of chromatic dragon with the traits of the five most common chromatic varieties, Tiamat was a foe to be reckoned with in battle.

Along with all the standard powers and godly senses of a deity of her rank, those who saw her fight claimed that her heads were able to cooperate in battle, and that those heads had the ability to use the breath weapons and spell-like abilities common to their species. Although her sheer size prevented claw and kick attacks while on the ground, she was adept of its use while flying. She also had a stinger on her tail that injected a powerful venom on her foes, killing them in agonizing pain.

History
In the First Age, much of the world was inhabited by ancient gods and beings of incredible power, power which Tiamat coveted above all else. Through her machinations she would often find herself in conflict with her brother, who protected the fledgling mortal races. This time was marked by frequent battles between the two, yet none more devastating than when the two took to the skies and determined to destroy her twin once and for all, unleashed all her power in a single attack. The energy blast was unsuccessful in hitting her brother, yet its power continued onwards, into the night sky where it obliterated a moon. Defeated and severely weakened she retreated to the depths of the ocean to lick her wounds, yet it would not be long until she was forced to the surface.

When Harmonic Convergence came, it caught all by surprise. A great sickness from beyond the stars rained down upon the material plane, the calamity swept across the world, killing god and mortal alike with indifference. Reluctant to assist the survivors, she bided her time until only a handful remained, yet it soon became clear all life was to end, an outcome even the hateful queen did not desire. She rose from the depths to fight alongside the few that remained. When the great battle had ended, she stood was one of the surviving eight gods and the pantheon of the Ogdoad was born.

With this proof of her strength her cult grew rapidly in the communities of chromatic dragons, especially among blue, green, and red dragons.

Once dragons as a race had established themselves during the Second Age the various religious factions of dragons began to battle one another over their different ideologies. Over time, religious fervor waned and draconic philosophers came to the conclusion that gods who allowed such behavior were not worthy of their worship. This started the draconic apathy toward their gods which lasted for thousands of years. However, the hatred that had developed between Tiamat, Bahamut and their followers was so intense that they refused to stop fighting. Their conflict came to be known as the Dragonfall War. During the first years of the war, Tiamat bred horrific and aberrant draconic creatures known as the Spawn of Tiamat, in an attempt to wipe out the followers of Bahamut.

Relationships
Tiamat was the antithesis of her brother Bahamut, as both of them represented opposing values, and this enmity was reflected in the attitude of each deity's worshipers as well.

She maintained a male consort from each of the chromatic dragon races. She had children with each of them and they served her as mortal agents.

Worshipers

Many evil dragons have worshiped Tiamat since their species first appeared in Aletrias and kobolds believed she was their creator, and although they didn't worship her as god, they revered her as their creator. After the incursion of Cargunth - The Lady of the Red during the Fourth Age she also gained a few dragonborn followers.

Church of Tiamat
The church of Tiamat was regimented by a strict hierarchy of ranks and titles. Her clerics were occupied by the twin tasks of acquiring an ever-increasing hoard of wealth for the faith and sabotaging the faiths of other deities. As a result, they occupied most of their time with an unending series of thefts, assassinations, acts of vandalism, and arson. More a dark reflection of the Church of Bahmaut than an actual religious organisation Tiamat accepted only evil clerics. They, like Tiamat herself, sought to place the world under the domination of evil dragons.