Katsuki's heart skips a beat when All for One says these words, how could it be possible that he retained a piece of One for All after Nabu? Deku still has the quirk and all semblances of power had left him once the battle was over as if the quirk was a temporary power up. Shouto, Nejire and Tobita freeze as well, looking to Katsuki to see what his next move is. As he is lost in the possibilities of what All for One could possibly mean, a trickle of cold sweat runs down from the back of his neck. The stiff uncomfortable suit that he was forced to wear during the exercise is bogged down with the weight of the rain, but even through the cold water on his skin, that bit of sweat running down his neck as if someone dropped a single droplet of liquid nitrogen between his shoulder blades. In front of him, the antlered nomu chuckles to itself, turning the piercing, disgusting, puss yellow eyes from Bakugou to the others around him. "So many delectable quirks for the taking, and you my dear boy..." He trails off before beginning to chuckle to himself, the monster's head turns back to look at Katsuki. "You have my old quirk, the one my son so cruelly tore away from me, thankfully for you he purged my influence from that duplicate quirk leaving it a blank slate. Otherwise I would be in your head much like I was in his mind. Additionally, you also possess the Quirk of my otou-chan... Yoichi Izuku Shigaraki."

"Just what the fuck are you on about? I don't have One for All anymore. That power left me after Deku killed that Nine fucker on Nabu." Katsuki hisses, channeling some electricity to his palms preparing to attack the first nomu.

"You may not be aware of it just yet, but that part of my quirk that you now sling about like a monkey with a hammer, held on to a fragment of the power of One for All. It's being kindled by the power you now wield, your quirks and the stolen ones. But I do apologize dear boy, I will be taking that back now, however I will give you one opportunity that may sway me taking your quirks. My son already turned down my offer, but you showed enough promise for my attention. It is why I wanted to recruit you to the league." All for One extends his hand outwards towards Katsuki, grinning wickedly baring the gnarled, jagged, gnashing fangs in the abomination's maw. "Join me young Bakugou Katsuki and together the world will be ours."

"I mean, with the most sincerity, Go fuck yourself." Katsuki vehemently declares before extending his hand and blasting the nomu with several million volts of electricity, the blue crackling lightning connects near instantly to his target.

"So be it." All for One declares, holding up a hand and catching the discharge of electricity in his palm. The energy swirling into a mass of ecstatic power aching to be dispersed from the form it had been forced into.

Katsuki raises and eyebrow at the use of this quirk, it seems to be a direct counter to both his and Kaminari's abilities. Though thankfully for him Kaminari isn't here at the moment but that doesn't bring any less stress to the situation at hand. All for One smiles as he extends his hand forwards blasting the mass of energy he had collected back towards Katsuki. While slower than the lightning Katsuki used, it's just as deadly. Immediately the explosive quirk user snipes the ball of energy with an AP shot, causing it to erupt in a massive discharge of electricity that arcs every which way as it tries to find a way to ground itself out. The others around him flank All for One on all sides trying to box him in, Shouto to the right, Nejire to the left and Mr Gentle behind the demon. The Lord of evil laughs at the predicament he is now in, the flames of the Hellfire quirk stolen from Endeavor beginning to reach higher as the Villain overlord slowly learns how to use the quirk. "Which one of you foolish heroes wishes to die first? If you attack now, I promise I'll make your death quick." He growls in a mocking tone, not noticing Katsuki gives a slight glance to Gentle and get a nod in return. Making the first move, Katsuki raises his right arm and throws a heavy punch using the Air Cannon quirk that his adversary had used against All Might in Kamino. All for One himself is slightly impressed with the use of this quirk, and even more so when the wall of air rushing towards him hits him so hard it cracks several ribs in the Nomu's emaciated form. The force of the blast sends the demon lord from his feet and careening backwards, the air having snuffed out the flames currently present in his body like someone blowing out a candle. Being quite literally blown back, All for One can't help but feel a slight bit of pride in the work his son has done to strengthen his allies. Though that thought is short lived as he careens with a wall of rubber courtesy of Mr Gentle. The rubberized air bends and stretches due to the force being exerted against it but manages to dissipated most of the energy involved in the opening attack from Katsuki. The rubber then rebounds sending All for One back towards Katsuki who is rearing his fist back preparing for another strike.

The Nomu careens face first with the open palm of Katsuki who grabs All for One, lifts him over his shoulder declaring, "I'ma plant me a Dumbass tree!" Before slamming the villain head first into the concrete. The impact causing the reinforced concrete to shatter beneath him like glass fractaling out in a spider web pattern from the impact crater. Following up this attack, Katsuki uses his grip to burn the side of All for One's head before setting off the largest single hand explosion he can manage without his gauntlets. Though the rain washing away the sweat on his hands makes using his primary quirk slightly problematic as it keeps washing away the nitroglycerin that his quirk naturally produces. Nevertheless the explosion creates a massive fireball around him and All for One, the resulting smoke cloud obscuring the vision of the other heroes. However another flash of white light from the smoke cloud results in something being ejected from the smoke. Katsuki is thrown out of the smoke cloud due to a rebound from one of All for One's quirks, causing him to be blasted backwards by his own attack. The young hero is caught mid air by someone, thankfully its an ally arriving to the fight. Floating above them, holding Katsuki up by his arms, Nana arrives to the scene. The master of All Might glowing with a vibrant aura of silver energy created by One for All.

"What are you fighting?" She asks, being unable to see the form of the Nomu inside the cloud of smoke.

"All for One somehow. He's controlling the body of a Nomu with his quirk and he stole Endeavor's quirk and he has abilities that counter mine." Katsuki responds, though the response isn't what Nana would ever have wanted to hear.

"Welcome back to the land of the living Shimura Nana." All for One greets, waving his hand to the side revealing the wendigo form of his Nomu body. "I hope you enjoyed your stay." Though the moment of distraction gives a perfect window for an attack from Todoroki. The son of endeavor puts a hand on the floor creating a glacier that dwarfs the one he used against Sero in the sports festival. The ice spikes impaling the emaciated Nomu spearing his body high into the air. "Chilling." He says, the pun making Todoroki growl at the cockiness of the arch villain. "The quirk of my granddaughter is truly a powerful thing is it not?" He begins, using the talons on one of his hands to easily slice through the ice impaling him. The wound left by the glacier's impact sealing itself as soon as the foreign object is removed. "It's able to do many wonderous things, make people younger, erase worthless quirks... AND BRING BACK THE DEAD!" All for One shouts before practically teleporting In front of Todoroki, stabbing him through the stomach with the same talons he used to destroy the ice. Ripping his hand from the boy's side, Todoroki looks down in horror at the massive wound piercing his chest, stomach and liver as blood begins to stain his hero costume. Todoroki looks up at All for One with fear in his eyes as blood begins to trickle down the side of his mouth. His eyes shift to look at Nana and Katsuki before his father as he collapses to the ground.

"NOOOO!!!" Endeavor screams trying to get up off the ground, however Nana is the one to react first, launching herself at All for One practically spearing him with her whole body due to the force of the impact.

"TODOROKI!" Katsuki yells as he flies towards his classmate, the power of his All for One quirk preparing to transfer the only regeneration quirk that Katsuki has in his arsenal. "Stay with me, stay awake damnit." Katsuki declares before grabbing Shouto by the top of his head and force activating the regeneration quirk.

Thankfully the wounds begin to heal but its a slower process than Katsuki would have liked. If he gives Todoroki the quirk, he can't use his All for One to take it back as it would leave him in a comatose like state but the rate that forcibly activating the regeneration quirk and using it on him would leave the others in combat far too long without him. Its a gamble but one he's willing to take, his hand begins to turn black as All for One's power manifests giving Todoroki the hyper regeneration quirk that Katsuki himself had been given by Deku. Once its in Todoroki's possession, the wounds immediately heal, though the clothes and his skin are still stained with his blood. "Togata get your ass over here now!" Katsuki roars through a telepathic quirk, and in a short brief moments, the strongest single quirk user phases through the ground In front of Katsuki, his partner in crime Suneater soon to follow. "Half n Half is down for the count, one of you needs to get him and Endeavor the fuck away from this fight. He's been stabbed but the Regen quirk I just gave him is healing his wounds. Once you're get him to safety get your ass back hear because we're gonna need all the help we can get fighting that asshole." Katsuki orders, picking up Todoroki's unconscious form and draping him in Mirio's arms.

"What do you need me to do?" Tamaki asks, showing a bit more courage than he did earlier.

"Whatever you need to in order for us to get the killing blow. You can use abilities of anything you eat right?" Katsuki asks prompting Tamaki to nod. "I hope this idea works then, I'm gonna try to cut off one of that Nomu's arms if you can manage to get some of it hopefully you can use the quirks it was given. If not, just batter the hell out of him and try not to die. I don't have another regeneration quirk."

"Wouldn't that be-"

"I know but if I and Nana go down its our best shot. Deku for all I know is still down so I need to be the one to call the shots." Katsuki explains before patting Tamaki on the shoulder and heading back to the fight.

Now seething with rage, Katsuki blasts himself back to the fight. Nana herself has All for One by the collar continuing to deliver blow after blow to the Nomu's mouth. She strikes him so hard that the rain around them is momentarily parted due to the power exerted through One for All. Her repeated strikes causing her knuckles to bleed having been hitting against the gaunt face of the abomination. Her adversary trying and failing to find purchase with his hands over her trying to take away her float quirk. Paragon throws All for One upwards into the air before drilling him in the stomach with a full power punch as he descends, giving him no time to recover she grabs the beast by the neck before spinning herself and him violently. Moving so fast she's a blurr of yellows, reds and whites, she releases her grip from his neck letting him careen into the concrete once more before flying after him. "I think I've indulged you long enough Nana." He says before extending a hand, letting loose the rebound effect of a kinetic recoil quirk. Each punch she had delivered on the monster is magnified to a single point as he rears back to retaliate. Katsuki arrives back to the fight just in time to see this quirk activate and in this instance something awakens in Katsuki as well. His body moves on its own, blasting himself into the side of Nana forcing her out of the way of the attack from her nemesis. The discharge of the kinetic rebound quirk hits Katsuki head on, both knocking him unconscious and backwards through multiple light poles and a tree. So much force is expended in the retaliatory attack that the clouds above the fight are split apart revealing the midday sun. "Foolish boy." All for One gloats seeing Katsuki's unconscious form underneath a partially destroyed tree. "You are unfit to possess my quirk, unfit for my brother's either."

The impact did a number on Katsuki, though the shock absorption quirk that the Nomu at the USJ once held saved his life. The first impact overloaded the quirk, but it had recovered enough to resist the impacts from the light poles and trees. Though a few of his ribs were cracked and his right shoulder has been dislocated. Though something stirs in the vestige world, the arrival of another link to Yoichi Izuku's quirk. All for One was indeed right, as Katsuki finds himself standing in the void, covered mostly by an orange and black fog only exposing his left arm, face and legs. Before him nine figures exist in this world, six in their full forms and the last three like that of ghosts made of a colored smoke similar to that which covers him. The three he recognizes are those who still live, Deku's apparition is black with green accents to the smoke that makes up his silhouette. Besides him in golden fog is a vestige of All Might though this appears to be him but much younger. The last of the fog like forms is Nana's though hers is semi transparent and silver in color as if this ethereal form of hers is partially in this world and in another. Taking note of the new arrival, Yoichi Izuku steps forwards looking over Katsuki.

"I'd never expect that you would end up here, number 10." He greets though his words confuse Bakugou. "Don't be afraid, I'm not Deku, I'm his uncle, the first user of One for All."

Katsuki tries to respond but can't make anything audible, though Yoichi responds to his thoughts.

"We granted you our power to help my nephew in Nabu defeat a vestige of my brother. Though it seems that you unintentionally clung onto a fragment of that power. I know not if you would be able to pass on this power to your own successor, but you may cultivate it and grow as strong as the ninth, the fragment you hold is equivalent to the seventh, but can grow stronger with time and training. You aren't the true heir to the tenth's mantle as she is still being coddled and raised but you will be her guide as well as her father to teach her to use this quirk and the other." Yoichi explains as he puts a hand on Katsuki's shoulder. "Nana needs your help, your friends need your help. You've earned our trust and our power, so you must use it to slay Shigaraki Zencho."

From within Katsuki's soul, the familiar burning fury of One for All is rekindled. The flames of his might dissipate the world around him returning the hero to consciousness mere moments after he landed at the base of that tree. The familiar rush power arcs through the very air in orange bolts of lightning, his skin flows like that of Deku's full cowling but his hair dims turning near white as the power attempts to blend with the quirk thief's duplicate power.