Nightmare (Marvel)

From Multiversal Omnipedia

Nightmare is a demon that, as his name suggests, dwells in the nightmares of sleeping beings. He feeds on the fear that bad dreams produce, and can also use them to torture or mentally influence sentient lifeforms in their sleep. Nightmare has been opposed by many super-heroes, including the Hulk, Ghost Rider, and, most frequently, Doctor Strange.

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