Asa

The earliest appearance of the demonic being known as the Nightmare Nurse saw her working as a housekeeper named Asa for a woman named Alice Winter in the House of Mystery. Alice became ill, and Asa knew that there was no way to cure her. Since Asa was in need of a new 'host', as her current body was old and decrepit, she decided it would be best for her to possess the younger woman's body. Alice's body become Asa's as the Nightmare Nurse, the healer from Hell.