Carock

Essentially a large Wizzar, this boss guards the Maze Island Palace. He can be defeated only by using the Reflect Spell to turn his own magic attacks against him. His Japanese name is カロック Karokku.

Theory
Carock bears an uncanny resemblance to the Magician who tricked the Prince and placed Princess Zelda under the spell. The manual says that the magician died after completing the spell. It is possible that the magician and Carock originate from the same clan of magicians.