Shigaraki Tomura was truly and thoroughly pissed. Sensei had denied his request to hire the cannon fire he had recruited for the invasion of UA. Sensei had claimed to have a better idea. Some perfect weapon for the job.

Shigaraki thought he was supposed to be the one making decisions. Well sensei said mistakes but those were decisions too! And what kind of weapon did he mean? Shigaraki had never heard sensei talk about any weapon before.

Well, this weapon better be good.

Izuku remained in Stillwater prison for four years. During this time, he had bulked up considerably, the prison food, while not tasty, was still more than what was available on the streets. Izuku still held his title of "feral child" if anything he only got more aggressive in prison.

Many of the men had tried to take advantage of Izuku, in many ways, but none of them walked away unscathed. It should never be said that Izuku also came out unscathed. If he wasn't hurt in the fight, he was always hurt by the guards that paid him a visit afterwards. The guards of Stillwater prison were ruthless, the rejects from higher class places like Tartarus, paid less too. And these guards didn't like troublemakers. Needless to say, all the guards hated Izuku.

None hated the feral child of the undercity more than the warden. If there was any reason or any excuse for the guards to beat Izuku, the warden made sure it was taken, even if it was by him. In fact, it was usually by him.

It was typical for the Warden to pay Izuku a visit once or even twice a week, usually after another prisoner picked a fight with Izuku or Izuku picked a fight with them. The fighting always just seemed to happen. It wasn't so much in the beginning, mostly just defending himself from ill-intentioned prisoners, but then Izuku somehow found himself at the top of the prisoner's pecking order. And of course, being the "Biggest man in the yard" came with a lot more fights from the new guys and it was also now his responsibility to protect any prisoner who could defend themselves from too much harm. Meaning that Izuku was involved in EVERY. SINGLE. FIGHT.

Another fight that just so happened to be today. One of the lifers had picked a fight with a newcomer (Izuku is pretty sure he just has a few months in still water if he doesn't die first due to some small-time drug dealing charges) for his lunch. The green haired boy didn't step in until the lifer started to bash the poor dealers head into the ground, breaking his jaw.

The feral child of the undercity swiftly grabbed the man's wrist, twisting it so he was forced to release the dealer, before landing a swift kick to his temple, knocking him out with the least amount of damage, Izuku didn't need him seeking revenge or anything after all.

Only after Izuku had broken up the fight did the guards step in, throwing the child on to the floor harshly and cuffing him to take him back down to his cell in solitary confinement and the other two to the medical bay for treatment. And so Izuku sat, alone in solitary confinement, waiting for some of the guards and the warden, waiting to see what they had in store for his "disobedience" this time.

Maybe this time they would finally break him.

Izuku's thoughts got cut off by the sound of approaching steps. Izuku could tell they were dress shoes worn by a heavy-set man if the sound was anything to go by. The warden didn't usually wear dress shoes, but the man wasn't above it when he had to meet with some one important. Izuku continued his assault on the wall, waiting for his beating.

All for one walked through the mist portal to a loud banging noise. As he moved closer to his target's cell, he realized that the banging was the feral child's strikes against the concrete that made up his cell. If All for one was expecting the feral child of the under city to grow stronger and tougher in prison, then the boy exceeded his expectations. The feral child had grown to be the weapon All for one knew the world would make him.

"Who the hell are you?" the feral child's words drew All for one out of his line of thought.

"You know who I am." The villain wanted to know just what the feral child managed to learn about him before he had been arrested.

"Tch." The green haired boy stared to pace his cell. "The boogie man of the underworld. What do you want?" All for one was impressed that the boy had learned his nickname. Even that was usually kept under wraps.

"You." All for one wanted to know what Izuku could come up with from this response.

The boy sighed and continued to pace. "You want a weapon." All for one smiled. He got it in one guess. He was as smart as the rumors said.

"Yes. And you want out of this prison." The villain made his offer to the boy.

"Who said that I wanted out of here?" that threw All for one for a loop. Who wouldn't want out of this terrible prison? The kid had to be bluffing.

"I am here to offer you a position in my employment." The boy hummed in response. "I could offer you good pay and better… accommodations." All for one looked around in mild disgust, this prison really was terrible.

All for one could see the feral child's jaw tense. The villain knew he wanted to take the offer to have something better, but he was hesitant. "You know my methods. I know you helped me in the past. So, help me again, and let me help you. Join me and we can do anything. We can help anyone." All for one knew he had hit the mark when the feral child turned around to make eye contact with him.

A simple nod was all the child offered, and it was all All for one needed. The villain reached out and used his intangibility quirk to pull the child through the bars and into the mist portal that awaited them.

All for one was so excided to see that the feral child of the underworld was capable of now.