What happens when an insanely powerful group of adventurers, barely cohesive enough to be called a party, suddenly finds themselves walled off from all of reality by an impossibly powerful race of would-be multiversial saviors?

Toworia is what happens.

Trapped beyond the great barrier, the anchor of the Mistrealms, designed to thwart the outward bound intentions of any who would try the barrier, the world started as a loosely stitched series of extraplanar demesnes, anchored around a Tower. Gradually, after much work, turmoil, death, and rebirth, the land became the lands now known as Toworia.