3D Dot Game Heroes

Fuelle is a wizard that creates clones of himself. He and his clones shoot fireballs at you, which you can block with the Fire Shield or better (but I find it easier just to dodge them). Fuelle can also summon a variety of common enemies that can be defeated for red and green apples.

Fuelle cannot be damaged unless the torch in the middle of the room is lit. To light it, cast Lightning. While the torch is lit, you can damage Fuelle by striking him with your sword. You will only cause damage if you hit the true Fuelle, who can be distinguished by his shadow. When there are four clones and the real Fuelle, you know the boss is close to being defeated. You will probably have to light the torch at least three times before the battle is over.