[Source] Magma pebbles were non-organic thrown weapons utilized by the sentient Yuuzhan Vong species during their invasion of the galaxy in the Yuuzhan Vong War. Consisting of a shell filled with a thumbnail-sized glob of magma, the pebbles were primarily used to counter the battle droids that the Yuuzhan Vong warriors encountered while fighting, as the magma contained within could heavily damage the circuits and armor of droids.