Gulthir

Gulthirs were baatezu devils reduced to a ghastly, unclean form for failing their superiors and trapped in a punishment caste until they redeemed themselves. The gullet of a gulthir was certain doom for the baatezu that fell to it, for the lowly denizens of Hell embodied the two worst fears of devilkind—death and demotion.

Description
Gulthirs towered at tall and appeared as skeletons with ruddy, sallow skin that hung loosely from their  bodies. Their bald, square, warty heads were covered in tumors and other lesions, and hosted two points of crimson light that were their eyes. The loose, oozing wounds that served as their mouths had jaws that could unhinge, allowing them to swallow man-sized prey with a single gulp.