Fiery is a lava golem who takes controls of the worlds volcanoes. He wants to gain immortality on Earth by making sacrifices. His cult tried to make Mike into a sacrifice but Mike avoided the cult members, which angered Fiery.
As Fiery was chasing after Mike and friends due to this, he accidentally fell into the sea. Fiery promised to Mike that he will be back one day so he can make the entire chat his sacrifices for immortality.