Morpheel is a giant aquatic eye monster. In the first phase, use your Iron Boots to sink to the bottom of the arena. Use the Clawshot to target the eye on its tentacle and pull it towards you, then attack with your sword. In the second phase, the eye will detach and swim around. Swim after it (Zora Armor helps) and use the Clawshot to grab it, then attack with your sword. Avoid its suction attack.
