Tentalus is an immense, humanoid, octopus-haired monster. It has a single red eye on his face, and its skin is a mottled blue-purple.
Tentalus' battle is possibly unique in the series in that the battle does not take place in the boss chamber of the ship. Instead, Tentalus attacks the Sandship as Link enters the chamber, and he must escape from the depths of the ship, using Skyward Strikes on the tentacles forced through the hull. The battle officially begins on the deck of the ruined ship, where Tentalus reveals its body and the title card is shown.
After the title card is shown, Tentalus dives beneath the ship and begins pushing its tentacles through the ship. When some of its tentacles are severed, Tentalus resurfaces and attempts to strike Link with its massive arms. Tentalus' eye is its weak spot. Meaning Link must shoot long-range projectiles, such as an arrow, to injure Tentalus. The process continues until Tentalus begins destroying the lower deck, forcing Link to climb to the upper deck. Its tentacles grow mouths and attempt to strike Link several at a time. When Tentalus is defeated, it leaves behind a Heart Container and reveals Nayru's Flame.
During the battle's first phase, the Skyward Strike must be used horizontally or diagonally in order to sever the tentacles and reveal Tentalus. Reminder, the Skyward Strike can be charged when walking, which is necessary during this battle. When Tentalus emerges and hits the deck with its arm, Link has a chance to hit it with an arrow in its eye. Tentalus' head will fall to the deck, where Link can strike the eye with his sword. This process must be repeated, with Tentalus using more tentacles and withdrawing its arm faster as the battle progresses.
When Tentalus has taken enough damage, it will begin destroying the deck, causing a box to fall from an upper level. Link must avoid rolling barrels to climb the box and reach the upper deck. When Tentalus begins sending masses of mouthed tentacles at Link, they can be defeated with a single sword slash, though wide slashes are recommended. When enough of the tentacles are destroyed, Tentalus will roar at Link, giving him a chance to strike its eye and cause it to fall to the deck, allowing Link to strike it with his sword.
- ↑ "My analysis shows that by repelling a number of its aggressive tentacles, the beast will reveal itself. There is a 99% probability that the tentacles that attacked you on the ship, Master, can be attributed to Tentalus. I theorize that using a sacred power will be the most effective means of repelling the tentacles.
- ↑ "Results from my analysis confirm that its tentacles can be severed with a well-aimed Skyward Strike. I theorize that the creature's eye is its weak point, but the probability that you can actually hit the eye with a Skyward Strike is approximately 0%. Instead, I recommend utilizing long-range weapons.
- ↑ "To accurately strike at the creature's eye--its weak spot--a bow will be most effective. You can press [control stick] to move with your bow drawn. I recommend shooting arrows immediately after dodging attacks launched by Tentalus." — Fi, Skyward Sword.
- ↑ "Because this monster's tentacles attack incessantly and in large number, it is too dangerous to respond to them one at a time. My analysis indicates it is possible to repel the tentacles more efficiently by concentrating an all-out assault on them with your sword.