In the dreamworld of 0nir0, Morpheans are sentient beings native to dreams, independent from dreamers' consciousness.

Heart-Owls, once they find a dreamer they like, will settle in their chest, and become their heart. They will share the deepest of bonds, the dreamer also being able to see and hear what their owl experiences. This one has lost her bond in a tragic way, and has become a Heartless-Owl, preying on dreamers with empty hearts, locking their energy away. Although it is said that taming her and recovering what was lost would reward the brave...

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