Legions of Lillim (Patreon)

Ages ago a long vanished god carved the womb from Lilith's body to keep her from spawning more demons - instead, she found a way to replicate shadows of herself that are called the Lillim. 

The Lillim are strange spirits spawned from blood, desire, and the will of Lillitu. They all consider themselves the same being, thought their bodies only last until morning, when they fade away with the rising sun. However, as soon as another one is made (even if it's centuries later), it remembers everything it experienced before.  The more they feed, the stronger they get - and as they are all the same being, if one grows, they all do.