Lamashtu

Lamashtu was, along with her fallen sisters, a demon goddess of hell. In the words of the renowned exorsist John Constantine, she is a bit of a glorified vampire.

Biography
Lamashtu started working for a group of ancient and powerful warlocks called the Brujeria and one of her orders were to kidnap babies that descended from the family line of one of their members. To this end, she disguised herself as a nun and infiltrated the convent where Jupiter Constantine was about to be born and kidnapped the child after Furcifer killed her mother.

This attracted the attention of an occult dabbler within the convent, who summoned the help of John Constantine to rescue the baby. After succeeding to kidnap another child her identity was discovered by John but she fail to silence him when he stabbed her in the chest, forcing her to escape.

Eventually, John managed to track her down and rescue the baby but realized that the Brujeria needed the children alive so Lamashtu couldn't let them die. So, he threaten to kill the baby if she didn't tell him what were the Brujeria plotting and what was the Rising Darkness. She replied that the Brujeria found a way to break the boundary that kept Earth and Hell separate and that this would allow demonic creatures like her to roam freely across the land.

In the end, John used an amulet of Pazuzu to teleport Lamashtu away from them.