Wizards' Warren

From PatchworkWiki

An ancient and extensive system of tunnels through warm rock. Anyone wishing to explore will be lost without a ball of string - and even more lost with one; the magic of the warren's wizards being based on threads and weaves making even clothing into a spell.

The Wizards' Warren was apparently infected by the Digitalis parasite during the Time of tentacles and was subsequently removed from the patchwork.