Lilith is a demonic character mentioned in Jewish folklore. Nodens is her sexual partner.
According to one account, she is an avatar of Our Ladies of Sorrow (EXP: "Our Ladies of Sorrow" (RPG)) but according to another she is a Great One said to have been an Ancient One shaped like a female gug. (EXP: Malleus Monstrorum)
Lilith appears as an ageless woman of sinister beauty. With lusty crimson lips, a body whose sensuous shape has no equal, billowing raven black hair, and smooth alabaster skin. Anyone who is aroused by Lilith will find himself awestruck and dazed and under Lilith's command to do her bidding. She can walk through any obstruction and is known for visiting sleeping men, with whom she then engages in somnambular sex.
Lilith drains them of their energy and takes their semen. She may also observe lovers and, when they fall asleep, take some of their semen, which is used to create monsters and deformed creatures. Her children are the non-Mythos creatures that haunt the night. During the night, she cannot be harmed by physical attacks, but in the daylight she can be harmed normally. In combat, she uses claw-like fingernails and is able to drain a victim's energy and restore her own with but a kiss.