Like each of the Fear Lords, Nox was a mystery, and her origin (or even her very existence) was known to few. Nox was considered the most mysterious of the Fear Lords by the Dweller-in-Darkness, as few in all the Multiverse had even heard of her. Nox's true origins are unknown and are subject to contradictory accounts.
She was believed to be Nyx, the Olympian goddess of the night, of the ancient Greek myths. Nyx was possibly her true name.
In the 1930s, she allied herself with the General in an effort to gain power, leading him to the Amulet of Achilles and forcing him to make human sacrifices to sustain his own life, and occasionally enabling her to enter the mortal realm by inhabiting their corpses. Following the General's sacrifice of the town of Dark Hollow, West Virginia, she was finally able to fully appear on Earth, helping him carry out their plans. ...
Nox possesses the power to generate, manipulate, rearrange, and construct darkness. She can use this power in various ways, projecting darkness, generating darkness then constructing weapons such as swords out of it, constructing tendrils that can capture and ensnare foes, bind or slash. Many of her constructs of darkness can be used to absorb energy. Nox is especially thrilled and delighted seeing others in fear and terror states.