Ghaunadaur

Ghaunadaur (gone-ah-dowr), also known as That Which Lurks and The Elder Eye is a fictional god in the Forgotten Realms Campaign Setting of the Dungeons and Dragons fantasy role-playing game. Although officially considered a member of the drow pantheon, its followers include oozes, slimes, jellies, outcasts, and rebels. Most of its followers are lowly drow outcasts.

Overview
Ghaunadaur is considered to be highly unpredictable by any standards. It is not always necessary to worship it; sometimes, simply paying lip service is enough to earn a boon from the god. However, this is not often done, as it's equally likely that it will consume or maim the penitent without warning.

"That Which Lurks" usually appears as a reddish-purple giant slug, though it can alter its form at will. Its symbol is a purple eye on purple, violet, and black circles. Priests of the Elder Eye are required to make daily sacrifices, preferably willing sacrifices. If a priest falls behind in their sacrifices, they are required to say a prayer while coating their hand in magical oil and lighting it on fire. If the prayer is good, the priest may keep the hand. If not, then the hand will be consumed by the Elder Eye.

It is generally discouraged for priests of Ghaunadaur to be friendly with other priests; however, the Underdark is full of strange things. More information on Ghaunadaur can be found in "The Drow of the Underdark," the TSR AD&D 2nd edition rulebook.