Hub

The city of doors, home to Netherlings, a realm of magic.

Arranged in the shape of a wheel (inasmuch as it has a shape) Hub is composed of debris found throughout the astral plane.

Physical material is valuable. Magic is commonplace.

Home of The Order of Incarceration, among other such philosophically-inclined organisations and factions.

See also:
Gretchen, acquired and paid for with a wooden staff at the Hub marketplace
Sheraptus, current ruler of the Netherlings

Hub

Dark sun that isn't actually dark sun. SamHeymans