Quajath

 is an entity imprisoned under Tomb of the Worm in one of the islands of Eiselcross.

Appearance
The depiction of Quajath 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, It depicted a curling worm with tooth-like scales over its skin. Its mouth is an open ring of teeth with three ivory eyes set where its tongue should be. Its burrowing creates mountains and cliffs that look about to break and crush the crowd below.

Uk'otoa and Desirat the Twilight Phoenix
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.