Extended universe sigil Zoth-Ommog is a Great Old One and the third son of Cthulhu, featured in the Xothic Legend Cycle by Lin Carter.

He has a cone-shaped body, a razor-fanged reptilian head rather like that of a Tyrannosaurus rex, four broad, flat, starfish-like arms with suckers, and a mane of tentacles. How he swims or walks on the ocean floor is unknown, but it is possible that he has a slug-like foot similar to that of the Great Race of Yith.

Zoth-Ommog was imprisoned by the Elder Gods beneath the seabed near Ponape and R'lyeh. Like his older brother Ythogtha, Zoth-Ommog is served by Father Ubb and the yuggs.

Zoth-Ommog's legend is chronicled in the R'lyeh Text and the Ponape Scripture.


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