These stats based on the Demon Prince, ORCUS and Demon, Succubus stats.
Hit Dice: 30 (115 HP)
Armor Class: -7 
Attack: 2 Claws (2d8+1d4 Strength, No Save)
Special: Magic resistance (75%), +3 magic weapon required to hit, immune to fire and charm, level drain 1d4 with kiss, spells, magical abilities
Move: 12 (20 Fly)
Saving Throw: 3
Challenge Level/XP: 34/5500
Lilith is a demon prince(s) of lust and the patron of vampires (which often puts her at odds with Orcus). She has magic resistance of 75%, and is completely immune to fire and charm spells, At will will Lilith can Charm Person, create darkness (15' foot), polymorph himself, or use ESP. She can magic-user spells. She can cast the following each day: 1st:: 6, level: 2: 5, level 3: 4, level 4: 3, level 5: 2, level 6: 1. Her supple hands can quickly transform into razor sharp talons that drain 1d4 strength (no save) on a successful attack.
Lilith is never encountered alone. She is normally surrounded my an entourage of succubi and incubi as well as several powerful witches (magic-users) and vampires.