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This is Naruto at the 4-tailed stage. Unlike the first four stages where Naruto was in control of himself, in this form, the Nine-Tailed Fox has a grasp of Naruto in his internal Demon Fox prison. This result is that Naruto has no control of his body and the seal that traps the Nine-Tailed Fox in Naruto loosens further. In addition, the chakra that the Demon Fox emits overtakes Naruto's physical body, leaving no visibility of human flesh. He is essentially on fire with chakra with his physical features are similar to that of the Nine-Tailed Fox himself. Not only does Naruto's appearance change, but his power is at its greatest ever. Just a roar produces frighteningly powerful and destructive effects. Even Orochimaru says that if he is to get hit by Naruto at this stage, he'll get killed for sure. Unfortunately for Naruto, this stage causes Naruto's lifespan to shorten. Being at this stage destroys his cells, but at the same time, because of the Nine-Tailed Fox's special ability, generates new cells to replace the destroyed ones. It would seem it would be a good thing for new cells to be made right away to replace the destroyed ones, but it is not. Everybody's body has a limit to how many cells can be produced in a life time. It is encoded in the genetic code. Because cells are being regenerated at an accelerated rate in Naruto's body so quickly, his life span is decreasing since he won't have the ability to produce new ones at some point later in time. (This is not only true for Naruto, but for us humans in real life. Cool huh? Who knew NARUTO was so educational)