Demon children who attack you at randomly in the game (and whose mother you eventually have to kill) all the while the world flashes and becomes an asylum covered in messages from dying children written in blood.
Evil forces that pull corpses together to make abominations.
Banshees that can only be killed by destroying the corpses that tie their souls into the world (which are usually hidden far away from the banshees).
Mysterious telephones suddenly appearing that drag you down to hell (think Silent Hill's otherworld) while the Big Bad tries to talk you into becoming a zombie. Sweet dreams!