I Was Parasitized by Nightmares at the Beginning, Devouring Everything

Strange things happen, and evil spirits kill people according to a certain pattern. I was forced to inhabit nightmares and gain strength by devouring them, but every time I used my abilities, I was sliding into an inhuman abyss. In order to survive, I was forced to deal with the authorities and die with my best friends. Until I discovered that all this was to cultivate me into... The ultimate sacrifice.