Warp Demons
Demons are the Children of Lilith, the First Wife of Adam. They are constructs of sin, and the opposite of Angels, and unlike Angels they are far more common in the mortal realm, tempting men with Sin. These however are typically lesser Demons, as more power Demons are actually Fallen Angels and are confined to Hell and influencing men from there imprisonment there.
These lesser Demons though that roamed the Earth, were left on a damned world as Humanity lost its world, and so found a way to leave the Planet and they searched the Galaxy for man again, and found Alien civilizations along the way wreaking havoc on the unprepared beings, however this was not as satisfying as tempting God's chosen creations, as it was so easy to manipulate non-believers as they typically already went against the commandments, usually from lack of knowledge of them.
Eventually though, they found a Civilization with strange powers, that came from some dimension unlike anything the Demons knew. This would be the force that could empower them beyond their Incorporeal forms, but they had no way to access it except for temporarily by possessing those with those powers, they needed to gain access for a more permanent infusion. They used this society and it combined Psychic abilities to locate the New Covenant, or what at the time was the Gomorrahn Republic with a fledgling rebellion that would become the New Covenant.
With the Aliens powers, they gained access to the Warp bubble that separated these humans from the normal universe, and when they finally arrived, they attacked the unsuspecting empire. They established themselves as a permanent Menace gathering a permanent following from the people of the Defeated Republic. Eventually they gained access to the Warp, and then the Warp Demons were born.
This was all perpetrated by the most influential of these lesser demons, Legion, the Demon that had encountered The Messiah, and was cast out by him. Legion had bided its time since then, not to exact revenge, but make itself permanent for fear of being cast back to Hell. To create its own Kingdom of Sin, and to become a god in its own right. The Warp allowed this, and Legion became the First Warp Demon, a Warp God, and the Progenitor of the Other Warp Gods.
The Warp Demons want nothing more than to torture and Defile the Mortal realm, to corrupt it with the Warp and make it their own.
In Progress