Abyss

The Abyss is an unfathomably deep, boundless space, believed to have presumably existed before Creation had taken form. The term comes from the Greek ἄβυσσος, meaning bottomless, unfathomable, and boundless.
==Description==
In the original sense of the Hebrew tehom, the abyss was the primordial waters or chaos out of which the ordered world was created. It is believed that from the abyss flows the ocean of metaphysical yet non-existential matter which Chaos reigned over for eons before the creation of primal matter by God.
The archangel Gabriel describes the Abyss as a "basement that's below the basement" just as he describes Limbo as being the "nonsensical attic" of the universe though the latter is separate from Heaven, which he regards more as " the never ending sky above all creation".
The Abyss is also a realm bordering Hell, and is revealed to be a place where most of the Ogdru Hem reside. Sir Edward Grey also states that the Abyss is more of an outer edge and bordered by the bottomless depths of chaos. Demons who rebelled against the leadership of Satan are banished to this realm.
==Overview==
When Lucifer and his rebel angels fell from Heaven, a handful of the fallen celestials landed not on Earth, but instead in a place obscured and forgotten by all of creation, a barren wasteland of everything in creation that been discarded by God, the edge of existence.
A preexisting rupture in the fabric of reality sprawled out across this land, its depths completely shrouded in a darkness so endless that it could break minds simply by being observed. It is said that the impact of the fallen upon this entrance to the abyss created a chain reaction which terraformed the wasteland surrounding the Abyss into a blazing inferno, and awakened ancient evils slumbering deep within the abyssal chasm.
The abyssal lords Pazuzu, Dagon, and Lamashtu among others are said to have come to power during this time, siding with the Ogdru Hem and sparking a war against the forces of Lucifer in a bid to claim dominion the newly established kingdom.
==Inhabitants==
Besides the Ogdru Hem, there are other strange and eldritch creatures of all shapes and sizes that inhabit the many lairs of the Abyss, some resembling jellyfish and cephalopods. Whether they are related to the Old Ones is unclear but given that the Old Ones are believed to be the original inhabitants of the Abyss, it is highly likely. These creatures also appear to be native to the Abyss making them older than angels and gods.
Some "demons" have also come inhabit the abyss, adapting well to the various chaotic lairs that can be found within the deep chasm, though only the strongest survive these hostile environments. Creatures that linger within the abyss will find their physiology being slowly warped by the realm, progressively becoming more bizarre in form until fully transforming into an abomination.