The Sorcerers of Sundered Earth.
Very little was known about the secretive organization that hid themselves away at the bottom of a canyon in a region the Eldritch called the 'Forsaken Lands.' It was an area of desolation where the sun baked the earth to brick during the day and froze what little water could be found at night. The land was criss-crossed with deep canyons that looked like they had been gouged into the earth by a being of tremendous size.
No Eldritch Lord laid claim to the Forsaken Lands and no one saw any reason to fight for them. However, some groups, like the Sorcerers of Sundered Earth, found the isolation offered by the brutal, unforgiving environment to be worth the heavy toll the climate took on any settlement that established itself there.