Full-Fledged Attack

Eri and Neri were helping defeat all the weak villains around. Izuku and Stain were focusing more on the two big villains. Izuku threw 3 of his electric kunai at the guy that had hands on his body. He dodged all three but fell into Izuku's trap. Izuku used the kunai as a decoy while he threw his quirk copying dagger. It hit the man and began to analyze his blood. On a small screen attached to the knife, it displayed that the man's name was Tomura Shigaraki, and his quirk was Decay. Izuku quickly picked up the knife and read what it showed. He told Stain to get to any high ground then he stabbed into the ground with his dagger. The floor started to decay. He directed the Decay at Tomura, but Tomura's Decay enveloped his and became stronger.

"Hey, did you forget about me?" The other man asked.

He shot a blast of blue fire. Izuku used his anti-gravity shoes to move closer, then used his quirk copying dagger on him too. His name was Dabi, and his quirk was cremation. He could burn anything with blue flames. Izuku shot a wave of blue flames. Dabi dodged, but he got hit a bit and burned his skin.

Meanwhile, Tomura and Stain were fighting. Tomura kept a pool of Decay between the two of them. Stain couldn't attack. Tomura kept tossing balls of Decay at Stain. Izuku noticed this and gave Stain his kunai; Stain threw one. It hit Tomura, forcing him to stop his decaying. Stain paralyzed him, then sliced his hands off, one by one.

{A/N: The hands that are on Tomura's body are of his family members, who he decayed to death.}

"Dad!" Tomura exclaimed as Stain cut the hand on his face. That hand was his father's, so he referred to it as "Dad." Tomura was angry. He decayed Stain's arm and said, "The hands of your teammates will replace the hands you just cut off!" Stain lost his arm, but his hand was on Tomura's face.

"Stain-san!" Eri shouted.

Her rewind went out of control, and Stain's arm was back. So were Tomura's hands. Everyone in the room turned into babies except for her and Neri, who fast-forwarded everything in a one-meter radius to protect himself. She opened her eyes and saw what she had done, then she stopped. Neri fast-forwarded the team back and rounded up the villains. Little did they know that Tomura's powers weren't controlled as a kid. Tomura started to decay everything. All his teammates were gone, but Dabi.

Neri quickly fast-forwarded Tomura, then Izuku started to fight again. He pulled out his ten hit sword and swung. Though it was blocked, it still counted. Izuku kept hitting until he got to nine. He aimed for Tomura's leg and hit. He couldn't cut it off, but his sword's power channeled into the gauntlet. Izuku moved it to full, then exploded it in Tomura's face, not killing him, but messing his face up. Through all the smoke, Tomura managed to counter and removed a leg. Eri rushed in and rewinded it back on. At that moment, Izuku was glad he had Eri on his team.

Izuku told them all to run away. He stayed. Izuku used one of his kunai to distract Tomura, then attacked from behind, but Tomura saw this coming. Izuku went back to where he left his quirk copy dagger and picked it up. He shot some blue fire at Tomura, then went to his side and kicked his ribcage with his anti-gravity boot, severely damaging Tomura's ribs. He followed by breaking his knee so that Tomura couldn't stand anymore. Izuku went in for the finishing blow when Tomura did something unexpected. He made a pool of Decay. Izuku noticed it, so it only burnt off a bit of his suit. Izuku attacked from above, with a downward jump kick, and broke his spine. Tomura was defeated and permanently paralyzed from the neck down.

Izuku forgot about Dabi. Dabi shot a giant blue fireball that engulfed Izuku, so Izuku was defeated too. Or so he thought. His suit was fireproof, but he forgot that also. Izuku replied with an even bigger fireball, after rewiring his ten hit sword and swinging ten times. His quirk copy dagger was as powerful as the real thing. Dabi moved those flames around him and advanced, making Izuku think he was done. Dabi stealthily attacked from above, then from the back. He went into Izuku's face so that Izuku would move back and into the fire. It worked, but his suit was fireproof. The way they were fighting, they would never end because they were both fire-resistant. Izuku walked to Tomura's body, then stabbed it with his quirk copy dagger. He gained Decay. Izuku started to attack with the fire from his gauntlet to trick Dabi. Once he got behind Dabi, he stabbed all his limbs with his Decay dagger so that his quirk was unusable.

Izuku beat Dabi as well, so he gathered all his strength and went to Eri. Eri healed his wounds. Izuku was about to go home when a man walked in.

It was just like how he was told. A big man with a mask and a deformed face. He was the Big Boss, the leader, the KingPin: All for One. Izuku used his anti-gravity shoes and dashed to the man, splashing his paralyzation serum in his face and temporarily blinding him. He then used his electric dagger and shocked him, followed by his electric kunai. He stabbed them into the man's back and directly poured the serum into his bloodstream then healed him so that the serum won't fall out again. Izuku used his ten hit sword then hit ten times. He exploded his face, ruining it more. Izuku kicked him with his anti-gravity shoes then used his concentrated gauntlet. Izuku used his special suit power along with his accumulated attacks and shot a blast. Izuku had defeated All for One.