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The Skullrus Rex is a monster in Final Fantasy Mystic Quest and the reincarnation of the Flamerus Rex. It guards the first floor of Doom Castle in a maze-like chamber modeled after the Bone Dungeon. It enters battle with two Shadow enemies and is easily defeated in one hit when the player uses the Dragon Claw against it. You can also use the Life spell for an instant win.
Final Fantasy Mystic Quest boss 12 - Skull Rex00:49

Final Fantasy Mystic Quest boss 12 - Skull Rex

Skullrus Rex boss fight