Nightmarish is a creature that lives in a Dream World, where the souls of those who fall asleep walk around at night. Few people manage to wake up alive after meeting her, because Nightmarish never comes in a dream with good intentions ...
She begins to haunt the soul of the sleeper, which in a panic rushes back into the body. Nightmarish cannot exist in real world for a long time because of the structure of her body, so she comes to our world for a few minutes during the sleep paralysis of his frightened victim, who cannot even scream.
At such moments, Nightmarish becomes tangible and visible to others.

It is believed that Nightmarish is one of the Titans (powerful creatures of enormous size, consisting of, as a rule, inanimate matter and carrying total changes in their envirounment.