Roseil is a hidden 'world' within the mortal realm, cloaked by a magic barrier to keep Roseilorns safe from persecution, poaching, and captivity/enslavement. 

In order to cover as little area as possible, lowering their risk of being discovered by accident by stray adventurers, Roseil is built into and around a majestic, but extinct volcano.

There are five sectors to Roseil, each broken up into several levels, and divided by class and social standing.