Make bull chickens creatures formed from the decayed parts of other dead... thingamajigers. Dude, seriously if you made fading enemies the closer you get to them, that would be sweeeet. OOOO and if you chase them you could make it so that once you get close enough they turn around and run up into your face REEEEEEALY close and really fast and their face could be something that looks incredibly scary, seen The Ring? If you have, I mean a face like that girl who died at the beggining. Pal green face, ripped jaw, light gray eyes. I'll google a picture if you want to know what Im talking about. (Like House on Haunted Hill! Seriously dude, watch that movie, its jam packed with good horror atmosphere ideas)