Morpheel

Twilit Aquatic, Morpheel (覚醒多触類 オクタイール) is the boss of the Lakebed Temple, the third dungeon in The Legend of Zelda: Twilight Princess. It is a massive eel-like monster with eight watery tentacles surrounding its large mouth and a single eyeball in its back. Morpheel was turned into a savage beast by the power of the Fused Shadow, suggesting it to be a more peaceful creature under other circumstances. The exact species it used to be before is unknown.

Interestingly, Morpheel is the only boss in Twilight Princess other than Ganon who bleeds when hit.

Battle
Upon entering Morpheel's watery chamber, Link must equip his Zora Armor and swim to the bottom of the chamber, where Morpheel's mouth and tentacles are seen sticking out of the sand. A single eyeball is constantly changing position within its tentacles. After equipping the Iron Boots, Link uses his Clawshot to rip the eyeball out of the gelatinous appendages and strikes it with his sword while Morpheel tries to grab Link with its tentacles and eat him, though it spits him out after chewing on him a few times. It is possible to prevent this by slashing Morpheel's tentacles when they come too close. Morpheel also expels a school of Bomb Fish from its jaws, giving Link a slew of decoy targets for his Clawshot.

After repeating this process a few more times, Morpheel erupts from the sandy chamber bottom, revealing its eel-like body, and begins swimming around the room. It will attempt to eat Link if he happens to swim within sufficient reach of its jaws or in front of it. This is the only way it can damage Link during this phase. After removing his Iron Boots, Link must use the Clawshot to grapple onto Morpheel's eye, which is now on the top of its head, and stab it repeatedly. This phase is very similar to the second phase of the battle against Argorok in that Link attacks the two bosses by latching onto their backs with the Clawshot and stabbing their weak spots. Additionally, the same music track plays during these battles.

After a number of blows, its eyeball is destroyed, and with no eyesight, Morpheel smashes into the chamber's wall, drains the room of water, and dies. Its body subsequently explodes into particles of twilight and releases the third and final Fused Shadow.

Video
oPSfHt_-3tI

Etymology
"Morph" literally means 'form', and it may also pay tribute to "Morpha", a similar boss from The Legend of Zelda: Ocarina of Time. The latter part of his name, 'eel', is a reference to his eel-like appearance.

Oktapesco Octópulo