Morpheel

Twilit Aquatic: Morpheel is the third boss found in Twilight Princess, and is located in the Lakebed Temple.

Appearance
At first, it is an anemone- or Charybdis-like creature with a single eye that constantly moves through the tentacles and must be extracted via Clawshot. After some time it shoots out Bombfish which Link has to throw at it and take them with his Clawshot to defuse them. Morpheel erupts out of the ground, revealing that it is an enormous, lamprey-like creature, and that the tentacles are only its feelers.

The manner of which Morpheel is fought in its first form is identical to that of Morpha from Ocarina of Time. Morpheel's tentacles resemble Morpha's ability to extend a tentacle-like water funnel from its watery body. Morpheel can also move its single eye through its many tentacles, in the same way Morpha can move its nucleus throughout the funnel of water, and both have to be removed with their represented game's hook device. Morpheel's American name is a combination of "morph" and "eel", and shares the same prefix, "morph", with Morpha. Its Japanese name is simply a reference to the fact that it has eight feelers.

Strategy
Morpheel's first form is simple to defeat. Link equips the Iron Boots, avoids the Bombfish it releases, then grabs its eye with the Clawshot. He then attacks it immediately, and repeats the operation. After two times, the creature's tentacles retract, and its eye gets swallowed, ending up on his back. Link proceeds to swim above it in order to use the Clawshot to latch onto the eye (the Critical Point). He slashes away again, only to be thrown off. He continues to do this a few more times for the monster to go down. Morpheel finally crashes into the wall, draining all the water in the room.

Upon defeating Morpheel, Link receives the third and final Fused Shadow and another Heart Container.

Trivia

 * Morpheel is possibly the largest boss Link has ever fought, along with Molgera, Dark Dragon, Bongo Bongo, Twinmold, Stallord, Cragma, Eox, and the Demon Train.
 * The strategy for defeating Morpheel incorporates the strategies for defeating both Morpha and Molgera.
 * The chamber where Morpheel is fought is possibly one of the largest chambers in the Zelda series.
 * When Link first enters, if he swims around the surface of the chamber, Midna will suggest that he dives.