Lens of Truth

The Lens of Truth a craft of the Sheikah, is a special looking-glass that can see through any illusion, although it drains magic power. Link needs it to see through all the dark spells of the Shadow Temple and other places.

In "" it is found deep beneath Kakariko Village's well and was once owned by a deceased citizen of the village. And in "Majora's Mask" the lens was hidden in a cave near Snowhead, Kaepora Gaebora helped Link find it.