Fog

This purplish fog is found only in the Earth Temple. If Link enters this, he will become "cursed", meaning that none of his items work, including his sword. The curse will not be lifted unless he gets out of the fog or finds a Light Beam. The Deku Leaf can blow the fog away from a small area at a time. The effect is similar to being cursed by a Blue Bubble. Also if he shines light at it with his mirror shield the fog will disappear.