Amy

This is the 4th Poe that Link encounters in the Forest Temple and is the hardest one to beat, because you can't touch it with your sword. Amy begins the battle by turning into four exact duplicates and surrounding you. If you try to attack Amy now, Links arrow will either go right through her (because it is the fake one) or by some luck hit her. Link can't tell who the real one is until the real one spins around. This leaves Link a short period of time left until Amy attacks, so target the real poe with your arrow and shoot her. Perform this attack three more times and she will perish and give access to the boss room.