Lava rocks were small volcanic rocks that could be picked up with the OmniWrench Millenium 12. They could only be found and spawn in mini volcanos in the ground. These rocks were used to destroy metal bar gates and other blockages. They would start a small countdown before they exploded after you picked one up. When they exploded on your Wrench, they did not cause harm but if they exploded on the ground when you were near them, you would get hurt. Lava rocks could also be used to throw at enemies or other breakable objects.
- Ratchet & Clank Future: Quest for Booty (first appearance)