The Arcane Labyrinth is a pocketplane created for Professor Morovar.
It was created by latching together the remains of the undergound ruins of a temple complex to Amaunator.
A small community of Derro and a few Aboleth in stasis were trapped during the creation.
To finish things off an Elder Neh-Thalggu was released inside the pocketplane.
The labyrinth consists of 6 separate areas joined by a central room under a giant pillar.
This central room contains the Cromatic Statue connecting everything.
A staircase in the 6th section leads to the other side of the Labyrinth and the true home of the professor.