Susanoo (Ten Tails)

Ryun Uchiha's  is the version of the dōjutsu technique, Susanoo, employed by Ryun Uchiha.

Overview
Ryun was said to be the most gifted user of Susanoo born into the Uchiha clan, likely because of his intense chakra and vitality, which allowed him to sustain it, where other Uchiha took a great toll from its usage. In its stabilized final form, it takes on the form of an immense (around the size of Kurama) fox, bearing ten tails. During the Third Shinobi World War, the shape and overall ferocity of his Susanoo earned him the name, as well as. In the years following, even the other Yonkō recognized this Susanoo as a force to be reckoned with — with Seireitou and Hikaru considering it to be on par with the power of a tailed beast.

True to this theme, Ryun utilizes his Susanoo much like a jinchūriki utilizes their tailed beast transformations — with the full, final transformation only being used as a last resort. Unlike in the normal Mangekyō Sharingan version of his Susanoo, the new Eternal Mangekyō Sharingan version has no gourd, therefore, it caries his Tonbogiri, and other spirit weapons, in its numerous hands. Much like Datara, he can also wrap himself in the specter's ten tails, providing additional protection. According to Ryun, only Seireitou Hyūga can hope to stop him while he is fully transformed in his Susanoo. Like his grandfather, Madara, Ryun can channel his various ninjutsu through Susanoo to vastly increase their strength. He can also use his own version of the Tailed Beast Ball, the Kokuhō, while in this form, as a type of mimicry — homage to his tailed beast-like appearance.

By forming Susanoo around his body, equipping it to himself, Ryun can form what he calls the. In this state, he wears the chakra and armor of Susanoo on his body like clothing, with the glowing gem of Susanoo's head resting on his own forehead. Ryun claims that this form is the perfect counter to a jinchūriki's Tailed Beast Chakra Mode. In addition to having Susanoo's perfect defense wrapped around his body, Ryun can also manifest any of his stabilized, final Susanoo's limbs; including its ten tails.

Mangekyō Sharingan Version
Ryun's version is depicted as crimson red in color, with green glowing eyes. The only oddities that Ryun's Susanoo displayed are an appendage on its chin reminiscent of a Pharaoh's false beard, two horns on its head, and the traditional two right hands as well as six fingers per hand that all Susanoo have. In its complete form, Ryun's Susanoo changes into the more common, humanoid form, and later, after the formation of Tsukiakari, he is able to produce a fully manifested Susanoo, complete with flesh and armor; taking the form of a ten-tailed. The complete Susanoo wields three spirit weapons; the Tonbogiri, the Wanyūdō, and the Shikinen Sengū.

Eternal Mangekyō Sharingan Version
With his Eternal Mangekyō Sharingan, Ryun's Susanoo changes form; In it's complete form, Ryun's Susanoo has more armor and wields improved versions of its spirit weapons. Finally, in its final form, Ryun's Susanoo becomes more distinct in its features and it also becomes far larger than the regular Mangekyō Sharingan version, gaining about the same height as a fully grown tailed beast. Furthermore, he can stabilize its chakra, making it around the size of Kurama, and in a similar shape — the only differences being samurai-like armor, and a tenth tail. His Susanoo's Eternal Mangekyō Sharingan version grants him a fourth spirit weapon; the Nihongo, which is a spirit spear completely immersed in Amaterasu's flames.

Unique to himself, Ryun has shown the ability to equip the Susanoo to his own body, by forming it into the shape of himself. He calls this Susanoo's "true form". In this form, his body radiates with red chakra and he wears the armor of his Susanoo's final form on his body. In addition, the glowing gem usually present on Susanoo's forehead is now present on Ryun's.

Nihongo
The is one of the three spirit spears produced by Ryun's Susanoo. Unlike the Tonbogiri, it is completely covered in the flames of Amaterasu; deriving this from the Shikinen Sengū.

Tonbogiri
The is an elongated spear-like spirit weapon, made of chakra, that instantly cuts in two anything that the blade touches. It was a spirit weapon awakened when Ryun completed his Susanoo. After obtaining his Eternal Mangekyō Sharingan, the Tonbogiri is stored within a large gourd on the Susanoo's third hand.

Wanyūdō
The is a shield, taking the form of a cross, similar in some aspects to the Yata's Mirror, however a skull forms in it's center. The shield itself is strong enough to endure large scale physical damage, but the skull has the ability to suck in and absorb ninjutsu that comes near the shield, making it a truly powerful defense. It is a spirit weapon of Ryun's Susanoo.

Trivia

 * The Tonbogiri (蜻蛉切) is one of three legendary Japanese spears created by the famed swordsmith Masazane, said to be wielded by the daimyō Honda Tadakatsu. The spear derives its name from the myth that a dragonfly landed on its blade and was instantly cut in two. Thus Tonbo (Japanese for "dragonfly") and giri (Japanese for "cutting"), translating this spear's name as "Dragonfly Cutter/Cutting spear".
 * Wanyūdō (Japanese: 輪入道 literally "wheel (輪) monk (入道)") is a figure in Japanese mythology, a relatively well-known yōkai in the folklore of Japan. Wanyūdō is said to take the form of a burning oxcart wheel bearing the tormented face of a man. Various folklore purports him as the condemned soul of a tyrant daimyo who, in life, was known for having his victims drawn on the back of an oxcart. He is said to guard the gates of Hell and to wander back and forth along the road between this world and the underworld, scaring townsfolk as he passes and stealing the souls of anyone who gets too close in order to bring them to Hell with him.
 * Like the Tonbogiri, Nihongo is one of the ; three individual spears that were made and crafted by the greatest historical blacksmiths of Japan.