The person who said Sun Song wasn't too far off. Do NOT shoot them with arrows whatsoever. They do absolutely nothing but make this disgusting muck noise. Bombs tend to not work...the only thing that will hurt them is your sword. Believe me, this is confir,ed. There is no way to attack them from far off. Also, the Song of Passing, received from Tott on any night, will stun them, like the Song of Sun or whatever in OoT. Then run up behind them and slash away and they die. Repeat if neccessary. Hope this helped! <3