That truly looked like a rain of magma… the skies had darkened due to the rain clouds that Billy had created after emerging from the steam emitted by the monster, and the area below was completely dark and red due to the glow of the falling magma. Using Telekinesis, he created a barrier around him to protect him from the magma as he prepared another attack and watched the massive monster falling to its knees.
Billy decided not to wait to see if the creature could regenerate itself. He decided that it was possible since the core inside itself could summon fire golems. Regeneration shouldn't be a problem if monster creation wasn't, after all.