The Great Abyss

The Domain of Demons

After Urgramaur, the Mother of Demons was defeated by Araquil, and banished to the Abyss her injuries proved too great. After crashing down, and expiring her shape dissolved and a myriad of weird and horrible creatures spilled forth, these would be known a Demons in the time to come, the most powerful of these we would know today as Baphomet.
These foul beings reside in a dark place called “the Great Abyss”. And although these beings are in some ways like Devils, their ways of existence vary wildly. Where a Devils seeks to entice and offer a pact, a Demon seeks to destroy and ruin. This is the reason these beings are locked away, and unable to leave the abyss on their own, for leaving the great Abyss is almost impossible from within the abyss itself as the knowledge to do so is easily lost or destroyed in the darkness thereof. One could summon a Demon form another plane quite easily, provided they possess the archaic information needed and a being with an intelligence matching the intelligence of the chosen Demon. As per rules of Planar Transferal.