Meg

This is the fourth Poe that Link encounters in the Forest Temple and is the hardest one to beat, because you can't touch it with your sword. Meg begins the battle by turning into four exact duplicates and surrounding you. If you try to attack Meg 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 Meg 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 basement floor.