Lava Pit is the third event inside the Blasted Mountain during series 7. Raven refers to the Lava Pit as "the heart of the Blasted Mountain." The warriors have to use sticks to fish skulls (of the same colour as the giant skull above their door) from a small island in the centre of the pit.
The winner is the one who gets 10 skulls on the shelves surrounding their door, which will open it. They will get 2 golden rings for winning, whilst the rest are burnt by the lava and lose a life.