Chee's Lair

Villains who have earned a great ire are sometimes subjected to dimensional exile as an extreme measure. The ritual that sends these exiles to a far-flung plane also traps them there- only the caster can summon them back. Habitable land is sparse here, and the residents fight bitterly to stake their claim on it.
Children of exiles are not bound to the plane. They could be everyone's ticket out someday. Even the most viscous exile protects the planeborn.