Ancor Vantian.

Shinno immediately started thinking about what he was going to do as Tendo didn't seem like he was joking. If he lied, there was a high chance he would die but if he told just enough of the truth, he could gain some backers from the Akatsuki. He decided to tell Tendo just enough information so that he would be satisfied but not enough for him to know everything about his nation.

Shinno: "Since you already know about the Zero-Tails, then you should already know about the Ancor Vantian. What else do you want to know?"

Tendo: "Just tell me everything about the Zero-Tails. Don't even think about lying because I have my own ways of gaining information."

Shinno began telling him everything about the Zero-Tails that he knew. How it was formed from the dark thoughts/feelings of the downtrodden people sealed in the Land Of The Sky and much more. When he was done, Tendo compared everything that Shinno told him with the information from his past life and noticed that he filled in most of the missing parts of the original story. The only Tendo wanted to know now was the location of the Ancor Vantian. As soon as Tendo asked Shinno that question, it was visible that the latter immediately got nervous by the sudden minute erratic movements of various parts of his body.

Shinno: "What do you plan to do-"

Tendo: "I plan to give the Land Of The Sky a chance that wouldn't end in your destruction. I will be your leader."

Shinno: "What?! Do you know what you're saying?! How can someone not from-"

Tendo: "I wasn't asking your permission. Call me unreasonable but the leaf is too powerful for you to defeat on your own. You will only go to your death and I think a man as skilled as yourself would be better alive than dead."

Shinno: "...So what do you plan to do with us, with me?"

Tendo: "You'll just be my second-in-command and I'll bring the Land Of The Sky to even greater heights than in the past."

Shinno: "I already know if I don't agree it would mean death and if I do, I'll just be a servant. Well, I don't have much a choice do I?"

Tendo: "No you don't. Tell me the location of the Ancor and you can come find me later when you're done masquerading in that village."

Shinno reluctantly told him the location of the Ancor and subsequently left to go back to the village, only to find that the patient that was supposedly 'healed' was in fact, dead. Amaru was next to his body crying profusely and Shinno was extremely taken aback. He had to say, he didn't expect to be put under such a complex genjutsu so easily but he would be lying if he said he wasn't impressed. Even Amaru was completely fooled. Shinno's interest was peaked as to which Akatsuki member came to him but he didn't think too much about as he knew that he would find out soon enough. Shinno was sure that the Zero-Tails would either kill or damage Tendo enough so that he could finish him off.

[Several minutes later]

Tendo was wandering around a large forest, looking for the Ancor. Apparently, it was hidden by some kind barrier that would ward of those who came close enough to it. The barrier was powered by the dark chakra of the Zero-Tails but that only made it easier to find as Tendo was still a demon. As expected, it wasn't long until Tendo sensed the giant fortress being camouflaged by an even larger cluster of trees. Walking through the barrier as if it wasn't even there, Tendo found himself being greeted by several sky shinobi pointing their kunai at him. Behind them was the massive sky temple known as the Ancor Vantian.{A/N: https://naruto.fandom.com/wiki/Land_of_the_Sky}

Tendo didn't even stop walking and just continued on his way, using his mutated sharingan to quickly spot the Zero-Tails in a sealing chamber underground. In the eyes of the Sky shinobi, they were each being killed by Tendo, and their brains reflected that type of pain on them when in fact it was just an illusion. It only took a few seconds for Tendo to find the sealing chamber and merge himself with the walls to head to said chamber.

As he landed inside the giant blue chamber that housed the Zero Tails and had multiple seals carved all around it, Tendo saw a large tan cocoon in the middle of the room. This was where the Zero-Tails was located. The cocoon, with the addition of several tubular attachments, allowed the beast to channel its dark chakra through the Ancor Vantian. The technique also acts to protect the Zero-Tails by absorbing any chakra from external sources which pose a threat. And currently, that threat was Tendo.

Large yellow arms quickly shot out of the cocoon and tried to encircle Tendo in hopes of absorbing his chakra. It was even more aggressive when it sensed how much chakra Tendo had within him and how similar it was to its dark chakra. It was that similarity that allowed it to sense him in the first place. Tendo just surrounded himself with natural energy and flickered through all of the hands that tried to stop him, grabbing onto the cocoon as soon as he got close enough.

A giant black snake made of mist came out of Tendo's body, instantly devouring everything in the room within its maws. The entire Ancor Vantian started to shake as the Zero-Tails tried its best to struggle out of Tendo's hold but unfortunately, the void had already claimed it.

[Ding]

[Host's body, soul, regeneration, and chakra strength empowered drastically. Dark chakra added to the host's own demonic chakra. The Zero-Tails has now fully integrated with the host. Completely perfect chakra control added. The Noh Mask, shadow hands, and the ability to create dark chakra infinitely added.]

[A few hours later]

.....

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Name: Tendo Senju (Hyuga)(Mōryō)(Zero-Tails)

Race: Void Serpent (Parasitic Body)

Age: 13(Will stop aging as soon as he becomes an adult)

Chakra Affiliations: Wind, Water, Earth, Fire, Lightning, Yin, Yang

Kekkei Genkai: Shikotsumyaku, Byakugan, Ice Release, Magnet Release, Dark Release, Power Release, Wood Release, Sharingan

Kama Seal owner/owners: Kaguya

Chakra Level/Reserve: Limitless(Dark chakra can be generated infinitely as long as there's darkness in someone's heart and our MC surely isn't good so...yeah...you get the idea.)

Overall Power: Demi-God(Under double rinnegan Madara, so yes, tailed beasts are fodder.)

SP: 44,505(This includes, Gamabunta, The Great Toad Sage, The illusion toad, Shin plus his clones, and the guys that killed Shion.)

Next Chapter: God Of Taijutsu.