How found: Go to the Goron Graveyard atop Mountain Village. Switch to Goron Link and pull Darmani's grave from behind until the area floods. Collect the Hot Spring Water in a bottle and head to the smithy in the cabin. Pour the Spring Water onto the block of ice on the forge. The blacksmiths will then offer to reforge your sword; pay them 100 Rupees and hand over your weapon. Return the next morning and they will give you the Razor Sword.

    How used: Increases Human Link's attack power. After 100 sword strikes, the Razor Sword will lose its edge and revert to the Kokiri Sword. The Razor Sword will also revert if Link plays the Song of Time.