Tiamat

"Doom comes, mortals."

- Tiamat

At a Glance
The Divine Goddess of Annihilation, the Void, and the Dark Sun (also known as "The End of Days") Tiamat was a nigh-unstoppable Hydra deity who was trapped by the combined members of the Divine Pantheon, at a great cost to the cosmos, in an effort to prevent the destruction of all realms.

Legends told that it was only mere seconds after her birth that Tiamat waged war on all creation. Striped in black, green, blue, white, and red vestments, Tiamat began to reduce realities and worlds to a swirling vortex of annihilation before the Pantheon, who, despite their differences, agreed to end her rampage. After waging a millenia-long war against Tiamat in which all mortal worlds were destroyed -- save for one -- it was the deity Pelor who gave his life to entrap Tiamat at the centre of a black hole, entombing the Goddess of Annihilation in a void realm where she would remain cast, unable to harm anyone or anything... With the black hole sealed by the god Corellon, Tiamat was banished from the Astral and Mortal planes... for a time.

Age of Adventure
Trapped in the vortex of the black hole, Tiamat crashed against the boundaries of space, wrestling against the boundaries of creation. Projecting her influence beyond the void, Tiamat was able to contact an unassuming vessel -- the scholar Karn, a distraught pupil through whom Tiamat began her newest plot against existence in many millenia.

In the vision of a bleak future, Tiamat used Karn to rip open a hole in the sun (which bordered her void-prison) allowing her to lash the tip of her tongue (mistaken to be a solar flare) through the hole and devastate the mortal plane in an occurance known as Dark Sun. This future would not come to pass, however, as a group of adventurers were made aware of this plot through the guidance of Ioun who littered personal clues for them in a bid to undo Karn and stop Tiamat's escape. With Karn defeated, Tiamat would remain in her prison looking for new ways to escape.