Naruto, the main character of the popular anime show “Naruto Shippuden” has several arsenals at his disposal. One of them is the huge amount of chakra that the nine-tailed beast, the demon fox, gave him, and another would be the enormous amount of healing power it gives him.

In episode 156 of Naruto Shippuden. It has been revealed that Sage Mode, an entirely new category of Jutsu that seems to surpass ninjutsu, further accelerates Naruto’s healing ability. As shown in the episode, Naruto hears this fact and generates an idea in his mind that he later practiced without Lord Fukasaku’s knowledge.

Although the obvious details that would give away the nature of the Jutsu have been deliberately hidden, there are several clues we could expand on. The first is that it was a Jutsu, mentioned in previous episodes, given to Naruto by Itachi Uchiha with implications that it could be used to defeat Sasuke Uchiha. The second is that there was a gigantic plume of smoke above Naruto after he was shown using it.

The first clue leads us to the fact that during Itachi and Sasuke’s fight one of the techniques that Sasuke Uchiha was unable to counter was Itachi’s last move, Susanoo. That said, it is climatically logical that this particular technique is the one that Itachi Uchiha has passed on to Naruto. The huge cloud of smoke dispersed over Naruto after the technique was linked to the enormous size of the creature summoned when Susanoo is performed.

There could be a lot of theories and speculations, but this is what I have posed as the answer to this mystery without relying on the manga. It will eventually be revealed as the story progresses. However, it would appear that Naruto is trying to somehow synergize his three most powerful arsenals; the demon fox chakra, sage mode and sosanoo. I’m sure it will be an amazing reveal when it finally gets animated.