Caligoven

Caligoven is the name of the world of Toxic Seas. It's a fantasy world of scattered mountaintop civilizations on the precipice of an unknown and terrifying fog, of bold adventurers taking their balloons to the far isles and generational feuds between raiding civilizations, of the hardscrabble existence on barren rocks that makes up the life of many above the fog and the leviathans that haunt the depths.

The magic of Caligoven, like life there, is difficult and limited. While there are priests and religions, there is no divine magic. Arcane power can only be gained through diligent study. Slow rituals, alchemical items, and expendable charms predominate. The limited magic of Caligoven has no power to permanently create matter, and the arts of teleportation and magical flight are long lost, if they ever existed to begin with.

The world itself is covered by a thick blanket of toxic gas. What civilization exists is found on isolated archipelagos of mountaintops and highlands, where the cities delve into the stony ground, making the most of the limited space.