Excerpts from the official lore book that was used during development.

Chroma, the Dream Eater. A vile and wicked being who feasts on the hearts of dreamers and neighbors alike, luring them like honey to a fly and leaving them a shell of their former selves. He calls himself the Queen’s brother, though there’s no known relation between them. No one knows where he came from, but wherever the cold and guarded Queen was, he would follow, waiting for the chance to take his meal. He is devious, playful, and persistent. He knows no love or joy, only a hunger that is never satisfied.

When his body was destroyed, they all thought that was the end of his evil. He, or what was left of him, sank into the very pit of the land, and yet found he still lived. And he still hungered ever more. He is the source of all corruption in the Land of Night. He lives in the roots and soil, in the once brilliant water that have darkened a sickly color, in the bodies of monsters that were once the lively inhabitants of this world.

He will never stop until he consumes all. He must be stopped at all costs.