Jubilex

Jubilex, also known as the Faceless Lord, is the Demon Prince of Slime, Ooze and Filth. Among the lessers of his kind, Jubilex is a monstrous mass of mobile ooze in a sickly rainbow of dark, putrid colors dotted with an ever-shifting array of jelly-like burning red eyes. Near-mindless, Jubilex seeks only to consume and defile, with vague ambitions of swelling in power until all of reality has dissolved into a slick morass of sludge, with nothing but ooze remaining. "Worshipped", if such a term can be used, by the vast array of slimes, Jubilex has little appeal to most humanoids, although he does occasionally develop worshippers amongst the crazier denizens of the Underdark (it has been postulated that he may actually be nothing more than an aspect of the Drow god Ghaunadaur, or vice-versa). As a consequence, his fellow Demon Princes mostly ignore him, not considering him worth the effort to destroy.

Jubilex shares the 222nd layer of the Abyss, Shedaklah, with the Demon Queen of Fungi, Zuggtmoy, with the two constantly battling for total dominance of the layer. In 1st edition, he actually had his own layer; the 528th.

Jubilex is apparently open-game licensed, as he has appeared in Pathfinder, where he has been promoted to have a slightly broader portfolio (poison and sloth) and is now one of the demonic patrons of the Drow.