Ten-Tails

This Ten-Tails (十尾, Jūbi) is the combined form of Kaguya Ootsutsuki and the God Tree, created to reclaim the chakra inherited by her sons, Hagoromo and Hamura. It is tied to the legend of the Sage of Six Paths and the birth of shinobi.

To end the beast's rampage, the Sage became the Ten-Tails' jinchūriki and later split its chakra into the nine tailed beasts to prevent it from causing further harm. Centuries later, its revival became the objective of Madara and Obito Uchiha, who both sought to become the beast's jinchūriki in order to further their objectives.

Background
Long before the founding of the hidden villages, during an era of endless wars between mankind, the God Tree, a tree revered as a deity, bore a chakra fruit once every thousand years. It was later revealed that the Ōtsutsuki planted the Ten-Tails seedling onto the earth with the intent to drain all chakra from the planet so that it could produce a chakra fruit for them to consume. Although it was forbidden to consume the God Tree's fruit, it was eaten by Princess Kaguya Ōtsutsuki, who used the power it granted her to end the wars plaguing the lands. Some time after this, Kaguya gave birth to twins who became the some of first people born with chakra. Later, deciding that her children's chakra was rightfully hers, Kaguya combined with the God Tree to become the Ten-Tails itself, which ravaged the land in an ongoing battle with her children. However, because Kaguya's true motives were not realised, it was instead believed that the God Tree itself had taken on the form of a monster in an attempt to regain the chakra that Kaguya had stolen.

In the final confrontation between the Ten-Tails and Kaguya's sons, Hagoromo and Hamura, the two managed to seal the beast into what would become the moon; its chakra was sealed separately within Hagoromo and making him the first jinchūriki. This act, along with many other great deeds throughout his lifetime, resulted in Hagoromo becoming revered as the "Sage of Six Paths". However, knowing that his death would unleash the Ten-Tails back into the world to continue its rampage and reclaim the chakra he had spread among humanity, Hagoromo separated the monster's chakra from its body and used his Creation of All Things Technique to create the nine tailed beasts.

Unbeknownst to the brothers, Kaguya had created Black Zetsu from her will prior to her sealing in order to facilitate her revival. To this end, it spent centuries attempting to unite the chakra of Hagoromo's sons, Indra and Asura, in order to awaken the Rinnegan in one of their reincarnations. Eventually, thanks to Black Zetsu's machinations, the Rinnegan would once again manifest itself in one of Indra's descendants: Madara Uchiha. With his new power, Madara summoned the empty vessel of the Ten-Tails back into the world and named it the Demonic Statue of the Outer Path. Joined by Obito Uchiha, who continued his work after his death, Madara devised a means to reunite the Demonic Statue and the tailed beasts back into their original form so he could use the Ten-Tails to enact his lifelong ambition: the Eye of the Moon Plan.

Personality
According to Kurama, the Ten-Tails cannot be sensed through such means as detecting negative emotions as it has no feelings or ideals of its own. Despite this, when it sensed the presence of the tailed beasts' chakra inside Naruto Uzumaki and was reminded of Hagoromo, it reacted by gathering chakra and strengthening itself. It was believed that the Ten-Tails was an incarnation of the God Tree with the singular goal of regathering the chakra that Kaguya had stolen from it, but in actuality, it was following Kaguya's will to reclaim all chakra for herself.

Appearance
The Ten-Tails is brown in colour and titanic in size; one of its hands is larger than any of the tailed beasts. While the beast possess multiple forms, common attributes include a single eye, which takes up most of its head, and spiky protrusions growing out of its back in a shape reminiscent of a conch shell. When it was initially revived in an incomplete form, the Ten-Tails possessed a grotesque bulb-like body with long arms and clawed hands, but no visible hind legs, as well as a wide mouth with multiple rows of pointed teeth and a single spike on its chin. Dark veins similar to those of a plant ran along its body, and the endings of its tails resembled leaf buds, which unfurled as it began entering its second form.

In its next form, the Ten-Tails took on the shape of an emaciated humanoid with elongated limbs and a twisting neck. It now possessed visible legs, which it used along with its right arm to stand, as its left arm was missing from the elbow down. The beast's head was altered greatly, as its eye remained on the front of its head, it grew a single ear on the right side, and its mouth — which now contained straight teeth and bore a grin — moved to the left side, with a single triangular nostril appearing above it. Several horns formed on various parts on its head: two above each side of its face, two beneath its eye, and another below its ear.

As it transformed, the bud-like attachments on its tails detached, revealing extendable tails which ended in humanoid hands. After further maturing, the Ten-Tails' body became less emaciated, it grew a complete left arm, and it began standing on its hind legs. It later gained an even more muscular appearance and the horns on top of its head grew in size. When Hagoromo and Hamura encountered the Ten-Tails, it strongly resembled this form, albeit with a bloated appearance and additional spikes on its body. It also towered over entire mountain ranges, being comparable in size to Hagoromo Ōtsutsuki's Complete-Body Susanoo.

After becoming the Ten-Tails' jinchūriki, Obito expelled a construct of the Ten-Tails from his body, which then split open to reveal a gigantic tree, much like the original God Tree. This tree form, which completely dwarfed the Ten-Tails in size, possessed a tall, straight trunk with a single purple bud situated on top, inside of which was the Ten-Tails' eye. This tree form was initially stated to be the God Tree, but it was later referred to as the Ten-Tails.

When Kaguya Ōtsutsuki lost control over the tailed beast chakra inside her after being hit by Naruto Uzumaki's Sage Art: Super Tailed Beast Rasenshuriken, she unwillingly transformed into a non-humanoid Ten-Tails that manifested as a bloated, white, rabbit-like form, with the heads of the nine tailed beasts growing from various points on its body. This chakra-based form of the Ten-Tails retained Kaguya's Rinne Sharingan on its forehead as well as ten tails ending in hands.

Abilities
The Ten-Tails is said to be the progenitor of all that exists in the world. A god that created countries, it has the power to swallow oceans, split the land, and carry mountains. Kurama admitted that it alone wouldn't stand a chance against the Ten-Tails, and stated that the Sage of Six Paths said that its revival would result in the end of the world. The Ten-Tails cannot be sensed through traditional means as it gives off the same sensations as the natural energy circulating throughout the world. It is also capable of manipulating that natural energy. When Naruto attempted to gauge the power of the Ten-Tails using Sage Mode, he was overwhelmed by the vastness of the beast's power, which Kurama claimed was immeasurable. Gyūki stated that the Ten-Tails would be unbeatable if it was allowed to reach its final form.

Chakra and Physical Prowess
The Ten-Tails has massive and overwhelmingly powerful reserves that are capable of bringing total despair and destruction to the world. Its potent levels also enable it to survive the death of its jinchūriki, forcing Hagoromo to divide its chakra into several portions (the ten tailed beasts) that are still considered to be immensely powerful. In subsequent forms, the beast's chakra increases significantly, enough to completely warp the shape of the Sensing Water Sphere at the Allied Shinobi Forces' headquarters into two connected spheres after reaching its second form.

Befitting its size, the Ten-Tails has immense physical strength and is deceptively fast, attacking Naruto and Killer B before either of them could react. It also easily deflected a Tailed Beast Ball with one finger, and created a shockwave strong enough to tear up the surrounding landscape with a single swipe of one tail. The beast is durable enough to withstand the backlash of its own point-blank Tailed Beast Ball; when its own along with Gyūki's detonated inside of its body, it briefly inflated before shrinking back down largely unaffected. Even wind-enhanced black flames only irritated the beast with no lasting damage, despite Amaterasu on its own being able to neutralize Gyūki. In its second form, the beast's tails effortlessly broke free from the various restraints created by the Allied Forces, and can freely expand in length and thickness in order to attack distant foes.

As the original tailed beast, the Ten-Tails can create a Tailed Beast Ball. In its initial form, the ball is fired as a continuous beam which could overwhelm Continuous Tailed Beast Balls from both Gyūki and Kurama without losing momentum. When the Ten-Tails matured into its second form, its Tailed Beast Ball took on a conical shape and gained an immense increase in range, firing speed and destructive power. By seeing across vast distances with its eye, the beast could hit targets great distances away from itself and destroy both mountain ranges and entire cities with a single shot. After further maturing, the Ten-Tails demonstrated the ability to unhinge its jaw, allowing it to unfurl a rafflesia-like appendage that functions as a cannon capable of firing massive and extremely powerful Tailed Beast Balls, capable of heavily distorting even the nigh unbreakable Four Red Yang Formation.

After amassing its chakra, the Ten-Tails' roar can stir a series of massive natural disasters. The Ten-Tails also has the ability to manipulate and alter its own body to some extent, allowing it to regrow lost limbs, purge burning flesh from its main body, and form additional hands to grab enemies navigating on its surface. To defend itself, it can spawn fission beings of many shapes and sizes, ranging from humanoid to animal-like in appearance, some of which wield weapon-like appendages on their arms.

Other Skills
In its final form, the God Tree's roots can extend and capture enemies as large as tailed beasts in order to absorb their chakra, turning humans into desiccated corpses in a matter of seconds. Its jinchūriki can shape these roots into other forms, such as giant wooden dragons. When the bud at the top of the tree blooms and the eye within is revealed, the Infinite Tsukuyomi can be activated. If the Ten-Tails is revived with only a piece of some of the tailed beasts' chakra, the bud may take up to fifteen minutes to bloom, though the process can be accelerated by absorbing more chakra. Those who are caught in the Infinite Tsukuyomi and attached to the roots of the tree are, over the course of years, gradually reduced to shells of their former selves and ultimately becoming White Zetsu.

Control
Madara and Obito could control the Ten-Tails in its first form by producing tendrils from its head, which then attached to their own necks. To properly control it in its second form, however, they had to reinforce their connection using Hashirama Senju's cells, and Madara suspected it would be impossible to control the beast in subsequent forms without becoming its jinchūriki. While connected to the beast, Obito was able to use its body as a medium to produce wooden spikes. A wielder of the Rinnegan can use the Six Paths Ten-Tails Coffin Seal to become the Ten-Tails' jinchūriki, obtaining the power of Six Paths Senjutsu and ten Truth-Seeking Balls. However, if the jinchūriki lacks sufficient mental strength to control the beast's power, they can undergo a psychological collapse, allowing the Ten-Tails to influence their actions. Extracting the nine tailed beasts' chakra from the Ten-Tails' jinchūriki does not put them in mortal danger, as the Demonic Statue of the Outer Path's powerful life force will sustain their life, though they will be left near death and rendered paralyzed for several months.