noun One who walks in his sleep; a somnambulist. ... noun A prostitute who walks the streets at night.

What is a Nightwalker?

1 : a person who roams about at night especially with criminal intent. 2 : prostitute, streetwalker.

What is a Nightwalker in D&D?

A nightwalker was a type of nightshade, a sentient undead monster from the Plane of Shadow. It was unnatural and malicious, and it took delight in the corruption and suffering of others. It was a creature of both death and shadows and had enormous powers over darkness.