|Eight-Tailed Giant Ox|
|Name||Eight-Tailed Giant Ox|
|Former Jinchūriki||Killer B|
|Jutsu||Tailed Beast Ball|
The Eight-Tails resembles an ushi-oni with four long horns on its head, similar to that of a Jacob sheep. It also has a fifth horn like protrusion on its chin, which appears to have been damaged, much like its lower left horn, part of which was sliced off in battle by A. It has a muscular upper-body structure, with a hunched back similar to an American bison, arms with spiked protrusions on the elbows, and hands with opposable thumbs like that of a human. It has no hind-legs, instead its lower half is made up of its tails which consist of eight tentacles that resemble the cephalopod arms of an octopus. This tails will grow back in the event that they are sliced off. It is also extremely massive, matching the Giant Squid in size.
According to Madara Uchiha, the Eight-Tails came into being in the waning days of the Sage of the Six Paths' life; to prevent the Ten-Tails' resurgence, the Sage split up its chakra and used his Creation of All Things (万物創造, Banbutsu Sōzō) ability to create nine separate, monstrous constructs of living chakra, which would become known as the tailed beasts. The Eight-Tails eventually fell into the possession of Kumogakure.
However, its ferocity was so great that none of its former jinchūriki could control it. They would lose control, and the Eight-Tails would go on a rampage and destroy the village, requiring the Third Raikage to form a special coalition to subdue it. During one of its rampages, the Third fought the Eight-Tails alone allowing his comrades to escape. During this encounter the Third managed to cut all of the beast's tails off, but both him and the Eight-Tails collapsed with their techniques before they could finish the battle. During another encounter the Third extracted it from its previous jinchūriki, and sealed it within the Kohaku no Jōhei.
At some point in the past, one Kumo-nin attempted to mimic the Gold and Silver Brothers by eating one of the Eight-Tails' chakra meat tentacles in the hopes of gaining the power like a jinchūriki, but died in process.
The Eight-Tails was said by Kisame to be the second strongest of the tailed beasts. With its great supply of chakra, it can fire massive chakra blasts. During Naruto's battle with the Nine-Tails within his subconscious, it was shown that the Eight-Tails had enough strength to temporarily restrain and contain a direct Tailed Beast Ball from the Nine-Tails, but was knocked out of the battle afterwards because of it. It is able to endure being burned by Amaterasu for a considerable amount of time. Its tentacles offer it several additional appendages with which to interact with its surroundings and strike targets, but they are also easily severed. Even with its immense size, it has shown a high level of speed when it attacks, and even fast enough to block Amaterasu with its fist. A single Tailed Beast Ball from it could penetrate nine of the thirty-six barriers without even exploding. Going with its octopus theme, it can also produce ink to blind opponents.
The Eight-Tails has been shown to be very intelligent, explaining the mechanics of the Tailed Beast Ball to Naruto, the weaknesses of his Nine-Tails Chakra Mode, as well as pointing out that until he and the Nine-Tails reach a formal agreement, Naruto will not be able to fully transform or perform the Tailed Beast Ball. The Eight-Tails even coached B in tactics on how to counter Kisame's water-based techniques. He is also very perceptive as he later worked out that the Gold and Silver Brothers were revived, after witnessing Naruto sense the Nine-Tails' chakra coming from outside of the training place that he and B were confined, correctly deducing that Orochimaru's Impure World Resurrection was being used by someone participating in the war.
In Japanese folklore, an ushi-oni (牛鬼, ox ogre) is a massive, brutal sea-monster with the horned head of a bull and the body of a sea animal, like an octopus or a crab. It lives off the coasts of Japan and attacks fishermen.