Lamashtu is the Mother of Monsters, and the source of madness and nightmares. In addition to being the primary deity of a number of monstrous races, she is also worshiped by some human cultists. These cultists seek to cause deformity in themselves and others, and celebrate it with hedonistic rites. Sentient sacrifice is often a part of their rituals.
Lamashtu was a demon lord before becoming a deity, and as such hates all other deities regardless of alignment, and considers them her enemies.
Lamashtu is Chaotic Evil.