Home Naruto Jutsus Naruto Uzumaki Rasengan (Spiraling Sphere)

Name: Rasengan, 螺旋丸, literally "Spiraling Sphere"
Type: A-rank, Offensive, Short range (0-5m)
Users: Yondaime Hokage, Jiraiya, Uzumaki Naruto and Hatake Kakashi
A technique incorporating the chakra control needed for both the tree climbing and water walking exercise.
The Rasengan is an A-ranked ultra-high-level technique that took the Fourth Hokage three years to perfect, hence, is said to require very high level of chakra control. Naruto had to master this technique to convince Tsunade to return to Konoha. Unlike the Chidori, the Rasengan does not "cut" per se. It "grinds" rather, literally creating a hurricane of chakra formed in the shape of a small sphere in the palm of a hand, between the size of a softball and a baseball. Upon its collision with a target, the chakra control needed to confine this Jutsu in a small compact spherical form may suddenly be dropped, the effect producing a rather violent explosive effect on the target. Overall, it does have a drawback: the Rasengan needs great chakra control. It is a self-sustaining technique so once the chakra is molded, the user doesn't need to generate any more chakra. This is one of the few jutsu that require no hand seals and can simply be activated with one hand.
With the Rasengan, the ninja focuses their chakra in the same direction of their chakra rotation, creating a spinning chakra flow, which is where the force of the Rasengan comes from. Focusing chakra to spin in every direction is the first level of this technique.

The second level of the Rasengan is power. This level of the technique forces the ninja to focus their chakra to produce a stronger concentration of chakra to add to the spin of their chakra flow. This creates the powerful outward force of the Rasengan, like a hurricane. Powerful, but uncontrollable. Creating a denser chakra is the second step.
The third level of the Rasengan is dominance. The ninja has to be able to use one hundred percent of their spinning chakra and one hundred percent of their powering chakra, and create a small shell to prevent the chakra from dissipating on contact. In this state, the Rasengan maintains a more focused and powerful force. As it meets friction, the chakra is captured and focused by the thin shell driving the force of the chakra into target. Controlling the maelstrom of spinning, dense chakra is the third step of this technique.
Before the timeskip, when Naruto uses this technique, he typically uses a clone to generate the swirl while the main body creates the shell of chakra to hold it in his hand. Afterward, Naruto was shown to be able to execute a Rasengan using one hand, but considering that he was under the influence of Uchiha Itachi's finger genjutsu, and that in every instance after this he has been shown to use a clone, he still seems to need two hands.

"Note that Sharingan cannot copy Rasengan because there are no hand seals involved. It can only copy jutsus which are performed by hand seals."

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