Rasengan (螺旋丸 (らせんがん); Literally meaning "Spiraling Sphere", Meaning (Viz) "Spiral Chakra Sphere") is an A-Rank offensive jutsu developed by the Fourth Hokage, Minato Namikaze, who evidently invented it based on observation of the Tailed Beast Ball. The Rasengan is an example of applying shape transformation of one's chakra to the "highest possible point", and was intended to be combined with the application of nature transformation using one's chakra nature affinity, creating the ultimate jutsu for a shinobi: one that is extremely powerful without requiring time-consuming hand seals to initiate. This process was eventually completed by Minato's son Naruto Uzumaki, but even on shape transformation alone, the Rasengan is a very useful, powerful, and versatile jutsu, as well as one difficult to learn and master, the number of shinobi known to have done so being only five.
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