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In a promo for FX’s Legion “Chapter 7,” that you can watch below, it’s finally revealed who exactly is the “Devil With The Yellow Eyes” that continues to haunt David.

Spoiler

“Devil With The Yellow Eyes” is Amahl Farouk, also known as The Shadow King. According to Wikipedia, Farouk is an entity of pure psychic energy which feeds on a hatred of humanity, manifesting itself by possessing the bodies of humans. Created by writer Chris Claremont and illustrator-cowriter John Byrne, the character first appeared in Uncanny X-Men #117 (January 1979) as the telepathic mutant Amahl Farouk.

Source: comic book movie