Juiblex

Jubilex (alternate spellings: Juiblex, Juibilex; also called The Faceless Lord) is a fictional character, a demon lord in the role-playing game Dungeons & Dragons. He does not have a physical form as we know it; those who have visited his dark, muddy realm claim he is a slime-like creature who swallows other creatures alive, spits acidic secretions and causes diseases in his victims which can be almost instantly fatal. Jubilex first appeared in the Advanced Dungeons & Dragons Monster Manual. He is likely derived from Abhoth, a similar demonic entity in H. P. Lovecraft's Cthulhu mythos. Juiblex's lair is on the 222th layer of the Abyss.

Jubilex also appears as a monster in the roguelike computer game NetHack (there spelled "Juiblex").

Jubilex is also worshipped as a god by some renegade drow as the god of molds and slimes, although he cannot grant divine spells or divine powers, as he has no divine essence (expressed in D&D 3rd edition as divine rank). In the Forgotten Realms campaign setting, Juiblex has been subsumed by and is now an aspect of the Elder Elemental God Ghaunadaur, the deity of oozes and slimes.