The succubus Morrigan was deemed too powerful by her father Belial, and her power was split in three. One part she got to keep, the second Belial kept, and the third was sealed away, eventually becoming Lilith.

Lilith

The succubus Morrigan was deemed too powerful by her father Belial, and her power was split in three. One part she got to keep, the second Belial kept, and the third was sealed away, eventually becoming Lilith.

All data from the awesome folks at Marvel.