Frakjaw is the Skeleton of Fire. Frakjaw and an army of Skulkins invaded the Ninjago Caves and traveled to the Cave of Black Echoes to find the Fire Shrine and Sword of Fire. Sensei Wu sends players to stop Frakjaw before he can get the Sword of Fire. Frakjaw is the boss of the Ninjago Monastery world. He can only be fought in his own 1-4 player battle instance called Battle Against Frakjaw!, which takes place at the Fire Shrine and can only be accessed by a Fortress Dragon Statue.