Desirat

 is an entity imprisoned under Mount Mentiri in the Cyrios Mountains.

Appearance
The depiction of Desirat in the temple of Uk'otoa on Urukayxl showed a crowd of people clustered around the base and above them three larger humanoid figures haloed by a light or aura elevating them above the crowd. Over them, occupying most of the mural, was a huge bird of dark purple flame wreathing the sky, its wings curved upward and then bent down, and where the wings ended, fire curled and burned. The feathers on the edges of the wings came up into purple and dark gray flame with bits and specks of deep red. Its beak was long and pointed and it had three eyes, each set with a large onyx stone.

Background
Desirat was the companion and mount of Asmodeus during the wars of the Calamity. She was captured and imprisoned beneath Mount Mentiri by the original pre-Divergence Cerberus Assembly and remains there, giving birth to the geo-thermal activity in the area.

During the time of the Julous Dominion, a group living in the area built an entire colony based around this god-like creature, calling it the Twilight Phoenix. They burned effigies to it and believed this was its resting place. However, they also made a lot of enemies, and the Julous Dominion itself hunted them down and killed them in their homeland around the base of Mount Mentiri.

Uk'otoa and Quajath the Undermaw
In the Yuan-Ti temple on Urukayxl, the Mighty Nein saw three murals: one depicting a giant purple bird with fire-like wings and three eyes of onyx, one showing a gigantic sea serpent emerging from the water with many small eyes of amber and three large eyes, and one of a worm-like creature with three eyes of ivory inside its mouth, plowing through the earth.