It is breakable, but once you have obtained it, you can buy it from a lady in some village. It is behind Hyrule Castle. Here are the steps, 1. Enter the west entrance behind Hyrule Castle. It should lead to prison cells filled with monsters. If you want to, fight them, they leave some really good stuff in the cells. 2. At the end of the cells hallway, go through the door. (Continues below)