A creature designed for a game dev project

Ghasts are parasitic ghosts that forces themselves into the mouths of their prey with a paper-thin hand that slips out of a sewn mouth. They appear as thin tattered sheets with eyes and a sewn mouth, their "body" flapping in the wind while giving a slight semblance of shape. The Ghast stimulates their host's thyroid into digesting constantly, meaning the host must eat constantly to stay alive. If the host is unable to feed itself enough, they'll digest themselves into a blanket of skin, the Ghast now looking for a new host.