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The earth slowly began to rumble before seven immense pillars of searing hot flames erupted from the ground below and encircled Shukaku while continuing to burn into the sky. The intent of this technique is to trap the opponent in the caged inferno and incinerate them until not even ashes remain. If Naruto had mastery of this technique then it would be capable of destroying something much larger like one of the five great hidden villages. The burning pillars slowly began to move in closer to Shukaku as the heat was slowly turning him into a giant glass statue, there was no way of escape, in a matter of moments the fire pillars consumed him and began to converge into one massive pillar before incinerating anything within and around it before releasing its final burst of flames into the air before dispersing.
Naruto was left on the ground, panting heavily from the use of that last technique. He may have had incredibly powerful chakra, and a lot of it, but he couldn't use so many powerful jutsu in quick succession without wearing himself out yet. Shukaku had only been the Ichibi, the weakest of the Bijū, and yet he had been pushed so far. It left a bad taste in his mouth.
Because of all the heat in the atmosphere above, thunder clouds began to gather and let down a heavy rain. Now was a time when Naruto still wished he had his hat. He looked over to where Gaara was moments ago and cringed at the sight. There was nothing but charred earth for miles, not even the ashes of Shukaku or Gaara remained. Temari and Kankuro had also been incinerated by that last jutsu, their unconscious bodies had still been within what was the forest and Naruto felt all their 'voices' vanish with the use of his Kenbunshoku Haki.
He would no doubt be getting a scolding from Obito for incinerating the entire forest in this section outside the village. At least Konoha still had one Mokuton user in its walls, had it not this would be very bad.
Now all he had left to do was release the Kyuubi from its genjutsu. He whistled for his summon to bring Natsuki back down. Not a second later was the medium sized bird with an unconscious Natsuki floating right above him. It dropped Natsuki from its talons, who Naruto caught in his arms. Naruto gave his summon a nod before it dispelled in a burst of smoke.
Naruto looked down at the redhead in his arms. How was she still unconscious after everything that had just gone on? Yes, he did place her under a genjutsu, but seriously, he had just turned this forest into hell on earth for a few minutes and here she was sleeping peacefully. He didn't know whether to be impressed or disappointed in the girl.
He laid her down on the ground below and forcefully opened one of her eyes with his index finger and thumb. Naruto activated his mangekyo sharingan, the normal three-tomoe design morphing into a four-point shuriken design, and cast a genjutsu on her so that he could enter her mind.
Within Natsuki's Mindscape
Naruto was instantly transferred to a sewer-like plane and was forced to wade through the ankle-deep water submerged the ground. The mind scape itself was like a maze, there were so many turns and dead ends that the only way Naruto was finding his way was because of his Kenbunshoku Haki.
He was following the presence of two beings. One was Nasuki, in a state of unconsciousness even in her own mind scape, and the other was the Kyuubi, who Naruto could even sense from here was in a trance. Normally when a jinchuriki was rendered unconscious, they were immediately transferred into their mind scape and forced into contact with the Bijuu, however, it seemed that Natsuki was forced into a state of unconsciousness so it seemed as if she was only rendered unconscious the first time in the real world. For Madara to have set up such an intricate design within the Kotoamatsukami was an astounding feat that Naruto had yet to reach.
Naruto finally entered the large dungeon with a cage as tall as the room was. Natsuki was half submerger with the ankle-deep water and the eternal-mangekyo sharingan pattern of Uchiha Madara replaced her usual violet eyes, a sign that she became trapped within the same genjutsu as the Kyuubi when she came here. The Kyuubi itself was laying down inside of the cage eying Naruto, the very same pattern replacing what should be slitted, crimson eyes. The trance was apparent, the Bijuu's eyes were opened, but the beast was not in control. It was likely that the Kyuubi was only woken from its slumber once outside of the jinchuriki-s seal.
How far the mightiest of the Bijuu had fallen.
Naruto still had his mangekyo sharingan active and whispered the name of the most powerful genjutsu in existence, the very same genjutsu that these two were under.