Evil Dreamer

A monster made from the spirit of a human who retained feelings for the living world even after dying. They chase around humans which they target, hoping to add to their friends. It will follow until it is destroyed, and will try to absorb the target's life energy by making its target have nightmares. Even if one is fortunate enough to survive, they end up being a hollow of their former selves, still entrapped by the nightmares from the evil dreamer.