This is part of a D&D project that I'm working on to add a new race of demon called the Lilim. This was originally part of an AD&D beastery by WebWarlock. The Lilim are based on old Jewish and Mesopotamian folklore (See: [link]
The Lilim are a race of seductive female demons that feed off the life-force of mortals. They are descendants of Lilith a woman that was said to have been born alongside Adam and left Eden to later mate with demons and spawn a new race of demon.
The Lilitu are the most powerful and beautiful of all the Lilim, they are all at least a millennia old, and are the daughters of Lilith. As calmly as they look, they vary powerful and can threaten even the more powerful Tanar'ri demons. Despite some simulator appearances they are not related to harpies. To suggest so to one invites certain death.