Dark Elf (Final Fantasy IV)

The Dark Elf is a boss in Final Fantasy IV. He bears a slight resemblance to Astos from the original Final Fantasy.

Story
The Dark Elf has stolen the Crystal from Toroia, and taken it into his lair in Cave Magnes. Cecil and his friends decide to get it back, so they can trade it to Golbez. The Cave Magnes has a powerful magnetic field inside - meaning that no metal equipment can be used.

The party somehow make it to the cave, but the power of the Dark Elf is monstrous. However, Edward uses the harp to disband the magnetic field and gives the party a chance to equip their weapons and fight back. The Dark Elf summons a Dragon to defeat them, but is himself defeated.