Multiple Shadow Clone Technique
Tajū Kage Bunshin no Jutsu · A-Rank Kinjutsu
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Creates a massive number of physical shadow clones by dividing the user's chakra across every copy at once. The technique is forbidden because an ordinary shinobi can exhaust or kill themselves by splitting their chakra too many ways; Naruto's enormous reserves make the risk unusually manageable for him.
Wind Release: Rasenshuriken
SPOILER!
Fūton: Rasenshuriken · S-Rank · Wind-Nature Rasengan
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Naruto completes the Rasengan's unfinished nature transformation by adding Wind Release and shaping the result into a spinning shuriken. The microscopic wind blades attack the target's chakra network and cells; early close-range use also damaged Naruto's own arm badly enough that Tsunade ordered him to stop using it in that form.