Because of Sasuke ego whole world had to suffer when he tried to absorb chakra of all nine-tailed beast into his susanoo he was not able control it and whole chakra got out of control and created a rift in space which start absorbing everything but before it can absorb Naruto Sage of six-path come up with a idea to help Naruto to save this world again by correcting his past mistakes. Some inspiration will be picked up from these following Fan-fics- : Legacy : Hope of the senju clan : Neo - Yondaime hokage : Unexpected Beginning Time-travell