Underdark

The underdark is a term for the vast network of caverns and tunnels beneath the surface of Alassia. Not much is known by surface dwellers about its geography or politics. Surface dwellers (humans, elves, gnomes, and halflings) and denizens of the underdark (dwarves, dark elves, orcs, and goblins) share a mutual distrust, even loathing, which often boils into outright bloody conflict. A few heavily guarded gateways connect the surface to the underdark, and passage is highly restricted.