Tiamat is the god and creator of all dragonkind. From the lowliest drake or kobold to the Dragonborn and Chromatic dragons… they all worship Tiamat.
She appears as a multi-headed dragon of monstrous size… she travels/flies all over the many realms, and even beyond. There is no where she cannot go, and very few things that would dare to try and stop her. Despite her monstrous visage, she is not evil. Tiamat encompasses all things.. good, evil, chaos… Those who follow her often choose to worship only one aspect of her persona (or head).. So there are those that worship her evil destructive side, and those that follow her inquisitive, wandering side, and those that worship her primal, creator side…
Tiamat does not have dominion in the Astral Sea. Its thought that her followers’ souls travel to her side and join her on the never ending journey.