All for One's Medical Facility, later:

"Sources saying that the technology stolen came from Dr. David Shield, but what the device was is still unclear-" *click*

"I-Island saying that Dr. Shield may have orchestrated the attack-" *click*

"-no comment on how the stolen technology disappeared, but thanks to the assistance of All Might, the villains were caught in the end." All for One turned off the screen, and turned to his doctor.

"And how is the device?"

"Well, if you're certain on using it how you want to, I'm not certain it'll work. But, what is science but trial and error?" The doctor hooked up the device to several other machines, and put two vials of red liquid in two slots of another device.

"If this succeeds, All Might and his new protégé will not be an issue to use any longer." he smiled as the machines whirled to life and electricity began to flow through the air.

Gran Torino's Apartment, days later:

"Keep up your form!" Gran Torino and Mirio were going head to head, both currently trying to land a solid hit on the other. As Mirio dodged an attack he slammed into Torino's arm, sending the old pro flying into a pile of old boxes.

"Ah! Torino, are you okay?" Mirio helped him up, and Torino simply laughed.

"I'm fine, boy. I'm fine. You're getting better at this. You've really gotten the hang of One for All." Torino smiled and flexed his arms and legs.

"Thank you, sir." Mirio bowed, and Torino got a serious look on his face.

"Any way, I'm sure Toshinori told you. About the history of his quirk, and who you'll need to use it against." At this, Mirio went stiff, and looked to the ground.

"... Yes, sir... to be honest, I'm not entirely certain I could handle someone like All for One. The Symbol of Evil who nearly killed All Might... But I'm still going to try my best! After all, I'm Lemillion! The hero who'll save a million people!" Mirio beamed with his heroic smile, and Gran Torino swore he saw a younger Toshinori looking at him.

"Well then, let's get back to work." And the pair returned to sparring, with Mirio now more confident than ever.

Weeks later, the League of Villains Bar:

"Oof! No fair! You've got more practice than me, Deku!" Toga pouted after Deku had slammed her to the ground again. The girl had a good quirk, but her combat skills left something to be desired.

"That's why we're training. Now, let's go again." Deku helped her up and the two squared off with their knives, both trying to slash each other. Kurogiri came in the room and cleared his throat, causing the two to stop.

"We've learned where the students will be attending their summer training. Our master wants everyone ready to move by tomorrow." At this, Deku bowed his head, and went off to get the rest of the League's members.

All for One's Medical Facility, hours later:

The doctor injected a glowing yellow serum into a Nomu and stood back as All for One used it like a puppet to attack a wall. The metal caved at the impact, and All for One smiled.

"It seems we succeeded." At this, red tendrils shot from his fingers and latched onto the skinny Nomu. The creature roared in pain, and after a few moments, All for One stopped.

"Well?" the doctor came over to his master, who simply sighed in disbelief.

"It seems my brother's curse remains in effect. The power can't be taken, merely given. However, with the second dose we have, that will not be an issue."

"I'm just grateful we managed to GET a second dose before the device failed on us." The doctor looked back to a broken and charred assortment of machines now resting on the floor as All for One made his way to

"Indeed. A shame we loss Dr Shield's Quirk Amplifier, but now... now we have One for All." All for One held up the second vial and smiled, knowing that now All Might would no longer be a problem.

The next day, Near The Beast's Forest in Nagano Prefecture, Deku Age 16:

The League stepped out of Kurogiri's gate and overlooked the forest where Class 1-A was having their summer training. Deku stepped forward and looked at everyone through his skull-like mask.

"Everyone remember the plan. Cause trouble, get the pros, leave the children scared and beaten. Nobody fails, nobody gets left behind."

"We don't get to kill anyone?" Muscular spoke out, and Deku sighed.

"Master would like the pros given to him, and we're not here to slaughter children. Right, Tomura?" Deku turned to the League's leader, who simply laughed.

"Right. They can live for now, we'll crush them when they're real heroes. Oh, and make sure to grab the boy Bakugo. He could be pretty useful to us. Now, let's go." At this, the rest of the League ran off, leaving Deku in his lookout position. He clenched his fist. They wanted Bakugo, why? He was too stubborn to become a villain, he wanted to prove he could be the top hero. He put these thoughts aside for now, he had to focus on the mission. He clicked his com-set in his helmet and broadcast to all channels.

"All members: report in."

"Tomura. Looking for people."

"Dabi here. Working on getting a few pros down."

"Toga here. Found a few people to play with. Shh."

"Compress, currently searching for Bakugo."

"Twice, having a good time. No I'm not."

"Spinner and Magne, found some students. Engaging now."

"Mustard, found another group. Engaging now."

"Moonfish, engaging now." As all the members checked in, Deku noticed someone hadn't. Muscular was silent, and Deku was instantly uneasy. Either someone had taken him out already or he was off mission already. This was why Deku hated wild cards like that brute.

"...Muscular, report in... Muscular!" Deku growled and went off in Muscular's direction. He had been wary of Muscular joining from the beginning. The brute had a good amount of raw power, but he was a simple thug who thought only of killing those who got in his way.

"I seem to be the only one here who doesn't actually have that compulsion." He thought to himself He had been running for a good while before finally seeing Muscular at his peak form in front of what looked like a child. A young little boy with a spiked hat on, currently crying in fear.

"STOP HIM! HE'S GONNA KILL HIM!" Izuku's voice rang out, and Deku shot a burst of flame near Muscular's head to get his attention.

"MUSCULAR! This is not the mission! And that one is not our target!" Deku raised his blade, and his ally simply laughed.

"What are you gonna do with that? You think you can cut me?"

"I don't need to." Deku made fire flow over his blade and ran towards Muscular. He slashed time after time, burning and knocking back Muscular with the shock waves from Hell Force.

"Heh heh. Tickles." Muscular rushed him, but Deku knew his fighting style. Simple swings with brute force behind them, but no real defense against close attacks. As the lumbering form of Muscular swung another punch, Deku slipped under his reach, pointed his knife at the man's face and shot a huge burst of fire at it. As the flames charred Muscular's face, the shock wave that followed put him on the ground. As Deku stood over his now unconscious opponent, he turned to see the boy now sitting up with tears almost gone.

"What's your name, kid?"

"... Kota."

"Forget this ever happened, Kota. And forget about me."

"... why did you save me? Aren't you a villain?" Deku stopped, and thought about it. Why DID he save him? He attacked his teammate, put down one of their strongest members... why? Because of the mission, because he needed to keep people on task, because of his hate towards him?

"Because even if you're a villain... you're still me." Izuku's voice caused him to pause, and Deku simply clenched his fist in anger.

"... Because you're a kid. And because you weren't the mission." Deku ran off, not looking back. He wasn't Izuku, he wasn't that weakling who wanted to be a hero. He was his master's weapon, a blade to end the age of heroes. As he was running, he saw someone in the forest. Stopping, he saw Bakugo. This was it, his perfect moment. He walked into the clearing, and Bakugo got ready to fight. Deku took off his helmet and tossed it aside, smiling at Bakugo.

"Hello Katsuki." Deku twirled his knife in the air and walked towards Bakugo, who simply stood ready to fight.

"Izuku..."

"No. Izuku's tucked away into my mind. I'm what you might call his dark side, Deku. And I've been looking forward to this for a long time. The day I leave you beaten and bruised in the dirt, the day I finally show you what you made me, the day I finally win."

"Izuku!"

"Little Midoriya isn't here right now! Leave a message after the boom!" Deku shouted out, blasting a bolt of fire at Bakugo who dodged out in the nick of time. The shock wave that followed made him stubble back a bit, and Deku charged with another blast. Bakugo unleashed his own quirk close to Deku's chest, causing the villain to sidestep.

"I have to admit, you're a lot more of a challenge now. But so am I. My master made sure to make me perfect my power, while you're still working on yours."

"Izuku, please! Stop this!" Bakugo blasted at the villain, only to see the boy side-step.

"I'M! NOT! IZUKU!" Deku blasted a giant wave of fire at Bakugo, causing the young man to use his quirk to try and deflect it. Most of the flames dissipated in front of him, but the shock wave knocked him to the ground. Deku walked slowly over to him, twirling his knife. "You know my name. You gave it to me. Go on... say it."

"Izuku, I know you're in there!"

"Yeah, he is. But all he can do is scream into the void. Even now I can hear his voice. "Don't hurt him, please stop!". It's pathetic. Even now, he doesn't hate you. All he wanted was to be a friend to you, to be like you. Hell, I don't know if he looked up to you or All Might more! And you treated him like dirt!"

"... I'm not giving up on you." Bakugo muttered while trying to hold his ground.

"And why is that? Because you feel guilty, because you hate what you did, because you can't stand the idea of me being better than you?!"

"Because I promised your mom I'd bring you home... She never stopped looking for you, never stopped hoping you'd come home. Even after the USJ, all she wants is you back. And I'm going to make sure that happens!" Bakugo coughed out, and Deku's stance relaxed slightly at hearing that. He stared at his old friend and former bully, before smiling.

"An empty promise... from a naive child. You were an idiot to even think you'd survive this fight." Deku raised his knife and fire flowed over it, glowing brighter and brighter. Bakugo tried to get to his feet, but his injuries were more painful to fight against than he thought.

"No, no, no! Don't you dare! Don't you dare! I WON'T LET YOU KILL HIM!" Izuku screamed out, and the blackness that surrounded his vision began to blow away, until he could see Bakugo in front of him clear as day. He dropped the knife, the flames slowly dying out as it fell to the dirt. He fell to his knees in front of Bakugo, who saw tear filled green eyes looking back at him.

"... Kacchan... I'm so sorry... the things he made me do-" Izuku gasped as he saw the darkness begin to slowly creep back into his vision, and Bakugo saw one of his eyes turning red slowly.

"Izuku, what-"

"He's too strong, I can't fight him, he's taking back control... Look in Kamino Ward." One of Izuku's eyes was now completely red, and the other was slowly changing.

"YOU ARE NOT GETTING RID OF ME THAT EASILY!" Deku's voice rang out in Izuku's head, and Izuku's vision was going darker than it ever had been.

"... Kacchan... please... save me." Izuku sobbed as his eye went red, and his face changed into one of anger. Deku was now in control again, and he blasted at Bakugo knocking him back a few feet. Bakugo lay on the ground, looking up at his old friend. Deku growled in anger at Bakugo, and another villain came up to Deku.

"Excellent, you found him. Now then-" Compress raised his hand at Bakugo, only to have it swatted away by Deku.

"Forget it. He's not fit for the League, no matter what we do. Let's meet up with the remaining members and go back." Deku rubbed his shoulder and picked his knife off the ground.

"But Tomura said-" Compress was cut off as Deku's knife was held to his throat.

"Tomura made a miscalculation. And I am making this call since he isn't here. We're leaving. Now." He walked over to his helmet and spoke into the communicator. "All members, report."

"I'm having trouble!" Toga came through.

"A pro's giving me a hard time." That one was Dabi.

"We're getting overrun here." Tomura shouted out.

"Magno and I need an extraction. Mustard and Moonfish are already down, but we've managed to snag one of the heroes." Spinner called out.

"Muscular is down as well. Kurogiri, we need to go." At this, Deku and Compress saw a portal open in front of them and stepped through. Bakugo looked on in confusion at what just happened.

"... Kacchan... please... save me." Izuku's words repeated themselves in his head, and Bakugo clenched his fists. He was still in there, his old friend. As he sat there, a few students came over to him.

"Bakugo! Hey, you alright?" Kirishima held Bakugo's shoulders and watched as Bakugo almost began to cry.

Training Camp Building, later:

The police had gathered about a half hour or so after the incident, arresting Moonfish, Mustard and Muscular. Several police were getting statements from students and the other heroes. Aizawa spoke with All Might who had arrived as well.

"No major injuries, no causalities. But Ragdoll was taken by a pair of villains. Bakugo says that he encountered Midoriya, and that he seemed to be under some kind of mind control or something. Personally, I think he might be reading too much into it."

"Maybe, but given what we know, we can't rule it out completely." All Might crossed his arms, and thought to himself. "Especially if HE'S behind this."

"All Might!" Bakugo's voice rang out and the young man rushed up to the number one hero. "He told me to save him! You're gonna save him, right? He said to look in Kamino ward. You're bringing him back, right?!" All Might looked into Bakugo's eyes and saw a scared kid looking back at him. He put his hand on Bakugo's shoulder and gave his signature smile.

"... Of course, young Bakugo. I promise you, we'll bring back Izuku Midoriya."

League of Villains Bar, earlier:

The remaining members walked through the warp gate and saw All for One's screen turned on.

"Now, now. I know you all feel like you failed, but we still have success. Now we have a more adequate understanding of these new young heroes, and we managed to snag one of the pros. You all performed well, even those we lost today. Mustard and Moonfish were loyal soldiers, and Muscular could've given us quite an advantage in our next stage." All for One spoke in a kind voice to them, and Deku stepped forward.

"... Master... Muscular's capture... was my fault." There was a tension in the air before All for One spoke again.

"... Explain yourself, Deku." His master's voice was filled with a cold tranquil fury, and Deku shuddered and gulped before he answered.

"He went off mission, attacking a child. Not one of the students, a young CHILD. He was a brute who had no desire to follow through on your ideals for the League. He needed to be dealt with before he became a risk to us!"

"... I will discuss this with you later, my boy. For now all of you await for further instructions." The screen went black, and Deku stood there in fear of what his master would do to him.

Police Headquarters, a day later:

All Might, Endeavor, Gran Torino and several other heroes and police were gathered in the meeting room to hear what Tsukauchi had to tell them about the operation.

"All right, listen up! Our priority is taking down the League of Villains. Thanks to one of the UA students, we now know the location of two of their hideouts. We'll strike both simultaneously. Our secondary objective is the capture or retrieval of Izuku Midoriya, who we believe may be under some form of mind control. I'll be honest, if this operation fails, it may very possibly be the beginning of the end for hero society. We'll make sure this incident is resolved successfully."

"This is our chance to finally get some answers about that boy, and to retrieve my comrade Ragdoll. We will do our best, sir." the hero Tiger spoke to the room, and

"Our intel says that Midoriya is at the primary location, so the bulk of our forces will be sent there. At the same time, we'll gain control of the secondary hideout and cut off their escape." Tsukauchi went off, and Gran Torino turned to All Might.

"Toshinori, if they want an old timer like me-"

"Old or not, you're still Gran Torino. And with stakes this high, I'm certain he's involved."

"The villains won't suspect us to attack after hearing Nezu's clueless act during the press conference. We have the element of surprise. So let's so these villains why they won't succeed!" Tsukauchi shouted out, and the rest of the room gave a shout of enthusiasm at this.

League of Villains Bar:

Kurogiri's phone rang to his surprise.

"Yes, master? ... Oh course, sir... Yes, right away. Deku." Kurogiri hung up as Deku came forward. "Master wishes for you to speak with him at the warehouse location. He says there are matters he must discuss with you. The rest of us are to remain here for further instructions." Kurogiri opened up a gate, and Deku stepped through. After he was gone, Kurogiri returned to the bar and Tomura walked up to him.

"And me? Master didn't mention me?"

"No, actually. I believe he wanted to discuss the encounter Deku had with Muscular."

"... He wants him to take over, not me... right, Kurogiri?" At this, Kurogiri simply stood still, and the rest of the League watched him to see what the two would do to each other.

"Tomura-"

"He wants him to lead, it's obvious. The way he talks to him, the way Deku acts, the way you look at the two of us differently. He's going to be given my spot, isn't he?!"

"Tomura, I-"

KNOCK KNOCK

"Hello? I gotta pizza delivery here." The entire bar went dead silent in confusion, all of them looking at the door. The silence was broken by a crash through the rear wall, where the form of All Might appeared.

"SMASH!"

"Kurogiri! GATE!" Kurogiri tried to open a warp gate, only to see Kamui Woods burst in right behind All Might.

"Preemptive Binding-" His arms spread out and gripped all the villains in wooden binds. "Lacquered Chain Prison." At this, Dabi started to use his quirk. Gran Torino then leapt in and slammed the burnt young man unconscious.

"You can't run anymore, League of Villains, because we are here!" All Might smiled widely at the villains and heard his walkie talkie go off.

"This is Gang Orca. We've taken down the Nomus, and we've found the secondary target. I repeat, we have Izuku Midoriya in custody." After hearing this, Tomura saw Kurogiri fall to the bar and the hero Edgeshot come into view.

"He was a tricky one, so I messed with his insides and made him pass out. You've got nowhere to go."

"No... no... You damn heroes! You've ruined everything! You and your peace and justice, you damn heroes! MASTER! HELP US!" At this, the villains in the bar were surrounded by a grayish goo and then sucked away inside of it. The forms disappeared, leaving only the heroes and police remaining. Several more blobs appeared, bring forth Nomus to fight the heroes. Turning around, Kamui Woods saw more Nomus engaging the police on the street and Endeavor going head to head with a few of them. The situation was complete panic for those present, but they were heroes, and they were determined.

Kamino Ward Warehouse, minutes earlier:

Deku stepped out of Kurogiri's gate and walked past the stasis chamber holding several Nomu. He saw the sleeping form of the hero Ragdoll that they had taken, and walked past to the rear area where his master was waiting. He was now clad in a skull-like mask with several tubes connecting at several areas in his apparatus. All for One turned to Deku, the mask giving him an air of cruelty to him. All for One placed his hand on Deku's shoulder, and the boy relaxed under his master's caring embrace.

"My boy, I have something for you. The doctor and I worked tirelessly on it, and we believe we have succeeded." He guided him towards a workbench where several machines and a glowing vial of liquid was sitting. All for One picked up the vial and held it out to Deku.

"This is our weapon against All Might and his successor Mirio. This is One for All, distilled, pure, at its base form. It took quite a while to achieve, and the device we retrieved from I-Island was damaged to the point of non-functionality. But now we have All Might's power. True, it's about a fourth as strong as his version and can't be stolen by my power, but it is One for All. With this, you can bring about our age of villains. Once All Might is dead, take this and use his own power to crush the precious people he sought to protect."

"... No. No... My god... you can't-" Izuku's voice was one of disbelief, and was more quiet than usual in Deku's head. Deku looked at the vial, and simply shook his head.

"Master, Tomura should be the one to have this honor. I'm not worthy of this."

"And why do you think that?"

"... Izuku Midoriya took control of me. It was for a few moments, but he managed to overpower me. I failed... I was weak." Deku bowed his head in shame, and All for One simply stood silent.

"... This is... unfortunate. But still, if you believe it would be better suited for Tomura." All for One handed the vial to Deku, who accepted it and placed it in his pocket. "Deliver it to him yourself, to show the confidence you have in him. That should help put his mind at ease a bit."

"Yes, master. But Izuku-"

"My boy, you are strong. You are power. You are my blade that will twist into this society of heroes, bringing it crumbling down. Izuku took control for a moment, but you are the one before me. You are the one in control, now and forever. Remember what I've taught you, and you will be Izuku's master."

"... Thank you, master. I will not fail you again." Deku got to his feet, and walked to the entrance of the warehouse, more confident than ever now. He looked to the sky in happiness, only to see a giant shadow come falling towards the roof. Rolling to the side, he barely managed to avoid a giant foot with a truck on it bursting through the ceiling. Deku saw the form of Mt. Lady holding a pair of Nomu before he felt his clothes tighten and restrain him. He looked to the side and saw Best Jeanist there with Gang Orca. The whale-like man spoke into a walkie-talkie once he saw Deku.

"This is Gang Orca. We've taken down the Nomus, and we've found the secondary target. I repeat, we have Izuku Midoriya in custody."

"I am not MIDORIYA!" Deku tried squirming out, but his now restraining fabric was holding him too tight. Tiger went over to the unconscious body of Ragdoll.

"Ragdoll, wake up for me!... What have they done to you, my friend?" The hero Tiger was holding the sleeping form of another pro, one they had taken earlier. Deku grinned. They thought they had won. However, there was something the heroes didn't know. His master was here.

"No, no, run away! Orca, Jeanist, everyone run! HE'LL KILL ALL OF YOU!" Izuku's voice rang out in Deku's head as All for One slowly walked to the heroes.

"I'm sorry for her current state, Tiger. But her quirk was so useful I just had to take it. How could I not? I haven't been able to stock up on quirks like I did before my body was destroyed." All for One's voice brought a chill through the air, and Best Jeanist used his quirk to restrain the man. All for One simply chuckled and used his air cannon quirk to blast himself free and target the heroes as well.

"Tomura finally came around to thinking rationally and making his own decisions. And yet you all got in his way. All that progress for naught. And you even tried to take back my prize student Deku. How arrogant of you all to try and do so. Now then, shall we begin?" All for One clapped as he saw what the hero had done.

"Using your quirk to pull them all to safety in the nick of time. I see now why you're the number four pro, with your creative thinking in battle. Consider me impressed." At this, Best Jeanist fired off threads at All for One, who simply blasted his air cannon into the hero's stomach. A gaping wound was followed up with a burst of pavement and rubble under the hero. All for One went over to Deku, and helped the boy up. "What do you think of his quirk, my boy?"

"... It would require practical experience and practice. Not really useful, especially if you're looking for raw power." As he finished, several blobs appeared, and the rest of the League appeared. As they all gagged and coughed, Tomura went over to All for One.

"Master! The heroes, they found us! We were almost done for! If All Might hadn't-"

"Tomura, listen to me." All for One put his hand on Tomura's shoulder. "You failed once more, but you mustn't be discouraged. You and your associates and your brother Deku are free to try again. Start over as many times as it takes you, and I will be here to guide you. All of this is for you." All for One helped Tomura to his feet, and Deku reached to his pocket and touched the vial before his master looked to the sky.

"... There you are." All for One pushed Tomura to the side and Deku saw the form of All Might falling to the scene. All Might attacked with both fists, only to be caught by All for One.

"I'll have you release that young man from your grip, All for One!"

"Have you come to kill me a second time, All Might?"

Hey guys, author here! Wow, that was another long one! And hopefully, the next one will take less time to do. Well, that's unlikely, because the next one is THE BEST FIGHT IN THE WHOLE SERIES and I am going to do it justice! However, with the holidays right around the corner I'll have less time to work on this, so be patient with me. So, as always, hope you enjoyed and thanks for reading!