This mysterious Jutsu ?

[Bijuu mode naruto]

In naruto wikia it says this

Being a descendant of the Uzumaki clan, Naruto inherited an incredibly strong life-force. This gives him extraordinary stamina and vitality, and by extension, an equally long lifespan. Despite his young age, Naruto has been repeatedly noted to have a massive chakra reserve, to which Kakashi, who also has a large reserve of chakra, estimated it to be at least four times greater than his own.[24] His chakra was described by Karin to be warm and bright, the exact opposite of Sasuke.[25] He apparently has some knowledge on fūinjutsu, as he knew how to use the seal's key after receiving Gerotora, and resealed Kurama after he separated it from its chakra.[26] Jiraiya had left Naruto with the key to help him complete an as of yet unknown technique which he, Naruto, and Minato have been working on, but never finished. Naruto stated that he was ready to complete it.
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I wounder what this jutsu might be? or has kishi for got about it

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[zenkutsu]

super bijuu dama rasengan?

 

[ANBU Kakashi23]

that "key" was the scroll frog right?

i thought that had something to do with the kyuubi's chakra

 

[Madara mhm]

yeh the key was gamatatsu, he was there when minato passed away, he then put himself in naruto so that he can learn that "Jutsu" as gamatatsu said in the manga... must be hella strong.

 

[Owarij]

Some people say the "jutsu" was just Naruto entering kyuubi chakra mode, and Jiraya gave kakashi the seal to stop it

he told naruto "don't use that jutsu" and naruto looked sad and said I know..
Right after that the whole naruto , deidara thing happened and kakashi said " so this is what he was talking about"


It can't be tbb or anything relating to tbb because when Killer bee first mentioned tbb and was explaining it, Naruto knew nothing about it