One with shadows, automatically hidden unless one makes a successful perception check when they are within vision radius (15 ft.) or they are put into direct light of a lantern.   Enshrouded assault: If the Shadestalker makes an attack while undetected previously, it is immune to attacks of opportunity from its target   Does not provoke attacks of opportunities if there is no ally adjacent to you   Appearance: WIS saving throw on it first being spotted, otherwise it causes super fear (fear, but applies to all abyss chickens and does not go away on loss of sight) [10<DC<20]