The Killer Eye is a guarding turret that will attack any foes within range. It will attack all enemies nearby, and unlike the Medusa Head, it will not attack allies or the one who placed it. However, its shots can still damage anyone, friend or foe. Once placed, the Killer Eye will attack foes with a ceaseless barrage of shots that do not nullify enemy fire but have strong knockback ability. Because the Killer Eye cannot attack foes who stand directly behind it, it is recommended for one to place it next to a wall in a large, open area.