Gemesaur King

Gemasaur King is a boss that appears in

Strategy
The strategy to defeat Gemasaur King is to throw three bombs at its iron mask just like in. While doing this, if a bomb explosion hits any of the crystals on it's back rupees will be dropped. These rupees can be collected, but they will all break off after the mask is broken. Then the mask will fall off and it will attempt to confuse Link by turning the room pitch black. It will dash around the room and try to trample Link, so he must use the Lantern to light the two torches in the bottom right corner and the top left. This will reveal him and he will stop dashing. Then you can slash at the jewel at his head, and once you have repeated this method, the monster will fall and Link will be victorious.

Trivia

 * The Gemasaur King is an obvious reference to its counterpart in A Link to the Past.