Poe

Poes are the spirits of the dead that wander various parts of Hyrule. They appear in Ocarina of Time, Majora's Mask and the Wind Waker.

In OoT and MM, they can easily be defeated by slashing it with the sword. After that, you can catch their spirit in a bottle. Drinking it will usually make you recover health, but it can actually damage you as well. They can be found in graveyards, and on Hyrule Field. Note that they'll become invisible for a while when targetting them, so you'll have to refrain from doing that.

In tWW, you must first shine light on them with the Mirror Shield, and only then can they be harmed. They will then run around the room frantically. Occasionally, they'll posses you, causing the cotrolls to reverse. They appear mainly in the Earth Temple.