Reward: Fira cape (needed for the lava cave), fire helmet, fire breastplate.
Needed: TNT, flashlight/candles,
At the graveyard by the dragon castle, there is a dark cave. Enter it and walk to the northwest side where you can’t go any further on the northwest side of the wall you should see a stone sticking out. Place some TNT and there is a secret entrance to a hidden room. Here you find the Fire cape needed to enter a very big lava cave at the end of the game.