A few days before the attack, Shredder lay nude on a table, with the fly man scientist looking over him.

"This is the device you asked for." The scientist said, holding a device that contained a glowing vial in it. "Once your heart slows down or stops to the point where it seems like you're dead or dying, this device will activate and release this new mutagen into your heart. And this isn't just any mutagen. Using what data we could extract from those crystals, this mutagen is the most dangerous version yet. You'll become exponentially powerful, but your mind will be lost, and your body will soon follow as it slowly becomes unable to handle your power. Do you understand this sir?"

"Yes. Just get this done with already!" Shredder ordered harshly. "...I am aware that there is a good chance I will be defeated by the Midoriya Foundation. Should that happen, I REFUSE to go down easily. Midoriya WILL regret the day he made an enemy of me. No matter what."

XXXXXXXXXXXXXXXXXXXXXXXX

"MIIIIIDORIYA!" Shredder shouted as he leaped towards Izuku, with terrifying speed.

KRAKOOM! KRAKOOM! KRAKOOM!

In a flash, Raiden shot himself towards Shredder and cut off his arms and legs.

But as Shredder fell to the ground, suddenly the stumps began to pulse and move, as his flesh began to move and heal. By the time he hit the ground, his limbs had grown back and he crawled back up, continuing his sprint towards Izuku.

Sakio barely put up the barrier in time, but that mattered little as Shredder's fist shattered it like it was never even there, as his bladed fist headed right for Izuku.

DING!

Izuku's phone timer dinged, as Shredder's fist and his blades were upon him.

SLAM!

As Shredder slammed his fist down, Izuku was suddenly propelled backward by some invisible force, allowing Izuku to dodge the attack in the nick of time.

Izuku let out a sigh of relief. Just in time.

Before going to the start of the concert, in case of emergency, Izuku had Shina use her quirk on him, so he'd have access to the Repel quirk. Of course, normally this would wear off before the battle had even started, so Shina had also put several delays to the effect.

Basically, she'd kill his quirklessness, then kill the last effect of her quirk. Meaning that he would be quirkless again until this new effect ran out. She'd repeat this a few times until a sizable delay time had built up.

And that ding from his phone had just notified him that the delays were done. Giving him access to the Repel quirk for the next nine minutes.

"MIDORIYA!" Shredder shouted primarily, as he pulled his fist out of the ground and got ready to chase Izuku, only for a freezing blast to hit its arm, freezing it. "HHRRRRGH! ARGHHHHHHH!"

Shredder immediately turned his attention to Sub Zero and charged at him.

Sub Zero barely managed to roll to the side in time, avoiding Shredder as he charged past him.

Shredder stopped and looked back over to Sub Zero, who shot another freezing blast at him, but Shredder blocked it, with his already Frozen arm. "RAGHHHHHHHHHH!"

He slammed his leg down onto the ground, causing the ground to shake, and Sub Zero struggled to keep his footing as the ground broke apart around him.

Taking advantage of this, Shredder picked up a chunk of the broken ground and chucked it at Sub Zero.

Sub Zero tried to jump out of the way, but the ground was so shaky and uneven, that he only ended up tripping, and the chunk of ground slammed into him, sending him flying back and burying him under it.

"RAH!" Shredder then smashed his frozen arm into the ground, breaking it off and allowing a new one to grow back.

KABOOM! KABOOM! KABOOM! KABOOM!

Bakugo came in from above, and unleashed a barrage of explosions down on it, destroying chunks of Shredder's body and leaving searing burns all over him, but it all just healed too quickly.

"Tch!" Bakugo exploded himself away, up into the air to avoid a swipe from Shredder. "That damn regeneration is getting on my-

SHING!

Bakugo went silent, as suddenly, Shredder had shot one of his blades out of his fist, right at Bakugo.

Unprepared for this, Bakugo had no way of dodging such a fast attack.

And the blade sliced his right arm, clean off.

Blood exploded from his shoulder as Bakugo fell to the ground, the shock and pain keeping him from moving.

"KACCHAN!" Izuku shouted in fear.

But this shout brought Shredder's attention back to Izuku, and he shot out two blades right at him.

Izuku activated Repel, causing the blades to lose momentum and fall to the ground.

"MIDORIYA!" Shredder shouted before charging at Izuku again.

Izuku activated his quirk to try and repel Shredder back. But all that did was slow them down, as Shredder pushed through the quirk's effect and stomped toward Izuku.

Then Sakio activated her telekinesis, and in combination with Repel, the two managed to keep Shredder in place.

"MI! DORIYA! MIIII! DORIYA!" Shredder's flesh started to pulse, and his body started growing.

"GRRRRRRR! Grandfather, he's getting too strong!" Sakio said as she struggled to keep her telekinesis field intact, but it was cracking more and more until-

SHATTER!

Shredder tore through the telekinesis field and charged at Izuku again, repelling, doing little to slow him down.

Seeing this Izuku repelled himself away from Shredder, propelling himself back, away from Shredder, but the monster was too fast, gaining on Izuku more and more until his blades were within reach.

Shredder thrust his arm forward, ready to stab Izuku through the chest.

"JUPITER! SMASH!"

Until Ochaco came in from the side, and kicked Shredder right in the face, sending him flying away.

"Ochaco!" Izuku cried out in joy, tears of relief threatening to leave his eyes.

"Thank goodness I got out in time," Ochaco said as she breathed a sigh of relief.

XXXXXXXXXXXXXXXXXXXXXXX

Back a few minutes ago, Ochaco was still in the netherrealm, running away from the massive hoard of demonic creatures that Scorpion had sent at her.

Fighting them was pointless. She'd taken down what had to be hundreds of them, and they just kept coming. She'd exhaust herself if she kept going on, which was no doubt Scorpion's intention.

Fortunately, Ochaco was much, much faster than them, and quickly outpaced the hoard.

Ducking behind a large rock, Ochaco leaned against it. Taking a moment to catch her breath.

After taking a moment, Ochaco turned to look past the rock, to see if they were still pursuing her.

But, as she turned to look, she felt a danger sense go off again. Something was behind her. Ready to stab her right in the heart.

Ochaco thought about the situation for a second.

SHING!

A sword went right through her back and out of her front, right where her heart should be.

"Agh. Ahhh." Ochaco choked and gasped, before quickly falling to the ground face first, as Scorpion pulled out his sword.

That took too long. I must return to the other post haste. Scorpion said as he turned his back. His body began to crackle with fire and glow as he started his dimensional teleportation.

And in that split second, before he'd teleported, Ochaco jumped up and punched Scorpion right in the face, touching him just in time.

The two of them teleported back to the real world, and Scorpion went flying, landing on the ground unconscious, and bleeding from his mouth and nose.

"Ugh." Ochaco groaned as she fell to one knee. A feeling of relief crashed over her. Her plan had worked.

She knew that the best way out would be Scorpion himself, and he'd probably leave immediately once he thought he'd killed her. So he just needed him to think he'd killed her, and then jump on him at just the right moment.

Thankfully, she could make Black Whip come from ANYWHERE. Even inside her own body, letting her move her heart out of the way just as Scorpion's blade ran her through.

Still hurt like hell and caused some serious damage, but she could deal with that later.

Because she could see what looked to be some kind of monster approaching Izuku.

With 50% of One for All's power rushing through her, Ochaco rushed towards the monster.

XXXXXXXXXXXXXXXXXXXXXXXXXXX

"So what happened?" Ochaco asked Izuku, as she looked over the battlefield, seeing Todoroki cauterizing Bakugo's wound. "Bakugo!?"

"RHHHHHHHHHH!" Shredder started charging back towards them.

"Gamma 1! Gamma 2! To me! Now!" Izuku ordered.

KRAKOOM!

Raiden dashed in and sliced into Shredder's side, but this time, his sword only went halfway through Shredder's body, before breaking.

"Shit," Radien swore, before ducking, barely able to dodge a swing from Shredder in time, before dashing away using his quirk.

Todoroki launched another iceberg at Shredder, encasing him entirely, but only for a moment, before he quickly broke out.

Ochaco then rushed in and delivered another punch to the face, sending him flying, before jumping back towards him to continue the fight.

XXXXXXXXXXXXXXXXXXX

Meanwhile, Gamma 1 and 2 were flying above a recently raided Foot base, watching as Midoriya Foundation troops cuffed the remaining Foot ninjas.

"Gamma 1! Gamma 2! To me! Now!" They heard Izuku order over coms.

"Alright! Time to put that Shredder guy in his place!" Gamma 2 said, punching his palm and grinning menacingly.

"Yes sir. We're heading to your location no-what?" Gamma 1 suddenly stopped and looked back down at the Foot base. "What the hell!? My scanners are picking up something!? This energy is…no. That's not possible!"

"Huh?" Gamma 2 looked down at the destroyed warehouse that had once been a base and saw a black orb forming in the center. "No way. These readings can't be right. Th-this is gotta be some kind of glitch!"

The black orb began to shift in change, until finally, it took the form of the corrupted All for One.

"Villains! Must die!" All for One(?) roared as he glared down at the tied-up Foot Ninjas.

"What the hell is that!?" The Midoriya Foundation troops quickly got into formation and aimed their weapons at All for One(?). "Open fire!"

They all fired their weapons at All for One(?) but none of them did any damage.

"Die!" All for One roared, as spikes shot out of his body. They would have impaled everyone in the room if Gamma 1 hadn't charged in and tackled him out of the building.

Gamma 1 pushed All for One(?) through several nearby buildings(all of which had thankfully been evacuated beforehand) before the seemingly revived boogeyman stopped himself mid-air.

Gamma 2 flew down next to Gamma 1, glaring daggers at All for One(?). "Why the hell won't this guy stay dead!?"

"He's resilient, that's for sure. But his readings indicate he's weaker than before." Gamma 1 said, pulling out his blaster. "We can do this!"

XXXXXXXXXXXXXXXXXXXXX

"Gamma 1! Gamma 2! Why aren't you here yet?" Izuku asked nervously, wondering what could possibly be making them take so long.

"Sir there's been a major complication!" Gamma 1 reported. "All for One has returned!"

"WHAT!?" Izuku shouted at the top of his lungs, now completely losing his cool.

Meanwhile, Ochaco ducked under a swipe from Shredder, before landing another blow to its stomach, sending it skidding back on its feet a few yards. But it simply rushed right back at her.

Ochaco activated Bright, and her body lit up, blinding Shredder, making him swing at her widely, and with Danger Sense, it made dodging all the easier. Ugh! I hate regeneration! How am I supposed to take him down if he just keeps healing?

"RAGHHHHHH!" Shredder roared, out of frustration at being blinded, not being able to hit Ochaco, or both. Most likely both.

Suddenly its body started to bludge, and then blades sprouted from all over his body. Legs, torso, head, arms, everywhere.

And Ochaco's Danger Sense went crazy. She jumped back, trying to get as much distance between herself and Shredder as possible. "EVERYONE HE'S ABOUT TO-"

Before she could finish, Shredder's blades fired out of his body at alarming speed, flying everywhere.

Izuku barely got his wits about him in time, to repel the blades heading at him, stopping them just in time before they could get close to hitting him.

Sori was about to grab Todoroki and Bakugo and start dodging, but the immense pain in her legs caught up with her, causing her to trip and fall to her knees. "Shit!"

Todoroki put up a wall of ice, but the blades cut through it like butter, as they continued heading towards the group.

KABOOM!

Bakugo, with his one arm, shot a massive explosion in front of them, sending the blades flying away from them.

He just keeps getting stronger damn it. Izuku thought. "All Midoriya Foundation Troops! Code Red! All hands on deck! Labs, I want felid drones on both All for One and Shredder doing analysis now! And get more heroes into the fray!"

This situation had just taken a turn for the worse. And he needed to make sure things didn't go from bad, to dire.

Just when things seem like they're going as planned, a wild All for One(?) appears.

Also sorry it took me so long to update, I got sick again.

Please review and have a nice day.