Like how Aernas is the land of the living and the Underworld is the land of the dead, Elyos is the land of the Asmodians, existing in a dimension seperate from that of Aernas. There are portals connecting Aernas to Elyos, but they have been sealed after the events of the First Demon Wars. The people of the Holy Kingdom in Bermesiah serve a god that maintains and protects the gateway between the two worlds. However, as a result of Ashtaroth's actions, the barrier between the two worlds has become unstable and weakened, allowing portals connecting the worlds to be opened across Aernas.