The Endless Maze

Baphomet’s layer of the Abyss is a never-ending dungeon, the centre of which holds the Horned King’s enormous ziggurat palace. A confusing jumble of crooked hallways and myriad chambers, the palace is surrounded by a mile-wide moat concealing a maddening series of submerged stairs and tunnels leading deeper into the fortress. 
The realm of Baphomet, the Horned King and Prince of Beasts. It was an infinite maze inhabited by minotaurs, ogres, and goristros. The obyrith Pale Night resided in the layer and retained control over a portion of it from within the Bone Castle.
(https://www.dndbeyond.com/sources/dmg/creating-a-multiverse#OtherPlanes, https://forgottenrealms.fandom.com/wiki/Layers_of_the_Abyss#Layers_501–600)

Alternative Name(s)

600th Layer

Type

Dimensional plane

Location under

The Abyss

Owner/Ruler

Baphomet

Ruling/Owning Rank

Demon Lord

Characters in Location

• Baphomet