*In the laboratory*
"Finally today could be the day we've been waiting for" the leader of T.R.E.E, and the elders of the clan were currently watching behind a glass screen, Izuna walking to the god tree unwavering. This was the most important day because they would now see if Izuna would be capable of withstanding the god tree.
All past test subjects had all been possessed and died, but here Izuna was walking forward without any fear. Considering the hell that he had been put through for the last two years it wasn't surprising that he would be fearless. It was only a matter of if he could withstand the test from the god tree.
Right now Izuna's mind was blank, he was only told his orders and knew nothing else. He was only made to complete his orders, and right now his mission was to eat the fruit of the god tree.
Right now his stoic face could be seen but behind that emotionless face, there was a battle being fought. In his mind, he was being continuously taunted but lucky for him he wasn't affected, because he had no memories of himself that the tree would be able to use again him.
Another battle was happening simultaneously in his body. But he himself didn't know what was happening to his body. Currently, he should be feeling agonizing pain but little did the tree know, he was immune to pain, so the only thing he noticed was that his body felt heavier that usual. He was the first out of all the test subjects that were unable to feel pain, even the doctors and scientists were unsure as to why he was, but that didn't matter to them as it only made it more likely that he would succeed.
Despite having no memories for the tree to take advantage of, he was still having a hard time as the god tree was draining his mentality. It was to the point where he was struggling to keep walking because he was so mentally drained, but he forced himself to keep walking. It was his mission, the only thing he knew and could do.
Staggering on towards the tree, it felt like forever had passed because the closer he got to the tree the greater pressure he felt making it impossible for any normal human. Finally, when he had climbed up to the top of the huge tree he saw the chakra fruit.
It was wrapped in an open shell with lush green leaves surrounding it. Lying in the opened shell was a small fruit, it looked like a dark, scarlet red strawberry but without the seeds and stem.
He picked it up and it felt weird in his hands, it almost felt alive and it was like a beating heart. He stood there in a trance for a few minutes before looking around.
Currently, he was a couple of thousand feet in the air. It had taken Izuna around two days to climb the god tree while having his mentality constantly drained. Izuna knew that he had to find a place to sit down so that he would be able to absorb the chakra of the fruit, and he definitely didn't want to fall, two thousand feet down.
He knew that this was the most important part and that it was also the most dangerous. If he wasn't able to handle the chakra from the fruit then he would die. So he would have to take small bites and slowly fuse the chakra into his body.
When he found a big, stable leaf, he sat in a meditation position and proceeded to bring the chakra fruit closer to his mouth. He hesitated for a bit before biting down, it was soft and melted in his mouth, but there was no juice, it was kind of like a Haribo but super soft.
It tasted like cherries mixed with mangoes and strawberries. Very odd in Izunas opinion as he had never tasted something like this before he lost his memories, but it felt familiar from his past memories, but he couldn't remember why as they had put a memory seal on him so that he couldn't remember his past memories.
But then when he started to chew and swallow it, he was hit with a wave of pure natural energy. Natural energy is a form of energy that exists in the atmosphere and the Earth. By gathering the natural energy in their surroundings and combining it with their own chakra, sages are able to enter Sage Mode and use senjutsu.
Izuna knew the basics of sage mode and nature energy, as he was taught this when preparing for this moment. So he knew what to do, if too much natural energy is taken in, then his body will turn to stone forever, so Izuna had to balance his chakra level with the natural energy.
By finding and maintaining the balance of chakra levels he was able to fuse the nature energy into his own chakra he had no idea how much time had passed but he want conserned as he was too busy fusing the nature energy into his chakra.
Little did he know that every time he was using the natural energy that was fused with his chakra, strange black tattoo like markings would appear all over his body allowing him to gain immense strength.
This was the sage mode provided by the tree, and without him even noticing his Mangekyou Sharingan activated and evolved into the eternal Mangekyou Sharingan. His eyes stopped spinning and they changed slightly but they still had the Shruriken with the spikes coming out the sides it just looked less curvy. (A/N. Click on paragraph comments for Izunas eternal Mangekyou Sharingan)
Finally it took Izuna 2 months to finish half of the chakra fruit, but he felt completely different, it was like his body was indestructible. He also felt immeasurable strength overwhelm him, but what was weird was that his body looked exactly the same except a bit more mature.
As he sat there shirtless he couldn't help but feel his body and his muscles out of curiosity of what the fruit was doing to him, and to his surprise they were rock solid, even his skin felt smooth but thick and tough when he tried to pinch it.
His skin now looked flawless, every girl would die for his skin, it was still slightly pale like previous but there were no wrinkles or spots anywhere, but he himself didn't care as he was never taught anything about beauty and girls, heck they never even taught him how to reproduce.
He also realised that his Mangekyou Sharingan evolved into the eternal Mangekyou Sharingan. He could tell this because the of the lack of eyestaine and less chakra usage that what it usually was when he only had the Mangekyou Sharingan, and he tested it out a bit and realised that he could use his ability much better now.
He then stopped himself from his curiosity and carried on eating the fruit. Days went by, soon weeks, then followed by a month. It was around this time when someone walked into the laboratory.
*back in the laboratory*
"Hey who are y-" someone tryed to stop him but they were killed without a second thought. The person kept walking not giving a care about all the people that started to surround him.
After a while, instead of that person panicking as they had expected, it was all the people in the lab, as they were mercaly slaughtered. One after one.
"Sir someone has broken into the laboratory" someone ran in and told the leader and the other elders of the clan. "He is very strong and we need all the support from the clan leader and clan elders" he said cupping his fists with a slight bow, to pay his respects.
"What, someone was able to find our hidden laboratory" one of the elders said with a frown.
"It seems that he is very strong as well, so it can't be a coincidence" another said in agreement.
The leaders brows furrowed "we need to gather everyone, tell everyone to stop because this is of great importance, if news gets leaked that we are in possession of the legendary god tree, then all our plans will fail".
The leader was caught completely off guard and questioned himself 'who would be able to find our hidden laboratory, we have been hidden for hundreds of years and something like this has never happened, do we have a traitor within our ranks, but who, also the test subject isn't back so it could be possible that he has already died, uhh why is everyone so useless'.
After that they all gathered and surrounded the intruder and to their surprise he looked completely unbothered, the intruder didn't even flinch or try to run away.
They all gathered to stop this one person but what happened next would shock the world and strike fear into any and all of the big nation's.
Black spikey rods were everywhere, everywhere and thing was destroyed, there were lakes of blood flowing down from all these spikes. If anyone saw this dreaded scene they wouldn't be able to even sleep after death.
There were countless bodies hanging from these spikes, missing body parts were everywhere, and yet one person was calmly walking around inspecting the place, completely unbothered.