This ninjutsu was exactly what Ueno Kei had taught Naruto after they returned from the Land of Waves mission and before the Chunin Exams began, meant to increase Naruto's offensive power.
After all, when facing ninja at elite chunin level or above, Naruto's attacks alone were still somewhat lacking. Unless he used the Nine-Tails' power—but Naruto at his current stage still could not control that power well. Besides, neither Ueno Kei nor Kakashi wanted Naruto to come into contact with that power so early.
Of course, if he trained gradually under Jiraiya's supervision, that would be another matter.
The difficulty of training this ninjutsu lay in how to form those three wind blades. Since they were created from pure chakra, if the control was unstable, the chakra would scatter. And because it was wind-nature chakra, its destructive power was extremely high, making it easy to injure the caster. When Naruto had first trained in it, he had often been cut by the wind blades due to one mistake or another. Even the slightest graze left a terrifying wound. In terms of sharpness alone, these wind blades rivaled the Lingyu Blade.
Even more terrifying was the speed of the wind blades. Dimension Slash possessed a speed capable of crossing dimensions; under normal circumstances, no one could react in time. That was also why this ninjutsu could be classified as A-rank.
However, its killing power was negligible against Kage-level experts, so it had not reached S-rank. Still, its usefulness could not be overlooked.
Originally, Naruto had not been able to master the power of Dimension Slash. Whenever he used it, he always failed to control either the amount of chakra or the timing, injuring himself every single time.
But Hyuga Neji had pressed him too hard this time. Ueno Kei and Jiraiya