-3D POV-

The Friday has come. Thursday for Y/N wasn't that eventful but he and Ruby had planned to meet up in her team's dorm so she could introduce them. Right now it was afternoon and Y/N was sitting in his Hundred classroom while listening to the teacher explaining to them about different fighting tactics and combinations. Soon the lecture was interrupted by the knocking on the door.

Teacher: Enter!

The door opened and to everyone's surprise the #1 hero of Union entered.

All Might: Good afternoon everyone!

Immediately everyone in the class started fangirling and fanboying but some hid it.

Teacher: Is there something you need All Might? You don't usually go into this department.

All Might: Yes actually. The headmasters told me that they found a student that would be perfect for a training exercise I wanted to do.

Teacher: Oh? And that might be?

All Might: To help teach the young heros to how to deal with an IS or a Hundred pilot if the situation requires so.

Teacher: Oh I see. And the student is?

All Might: Y/N Dimitrescu. I didn't meet the young man yet but I was told that he's in this class.

Y/N: *stands up* That's me.

All Might: Ah nice to meet you. Please head to the changing room and take your Hundred, then meet me at the fake city B.

Y/N: I already have it on me so we can go.

All Might: Alright.

Both of them left leaving quite a few jealous students behind. After a few minutes they arrived to the fake city and All Might led him to the observation room. Once entering they saw class 1-A in their hero costumes.

All Might: We have arrived!

Bakugo: Who's this extra!?

All Might: This is Y/N. He's from a Hudred division and today he'll be helping me with the lesson.

Momo: May I ask what it will be?

All Might: A fight against a Hundred. In hero work there may be moments where you'll be forced to fight an IS or a Hundred pilot till the backup arrives so today you'll be doing that. However on the way here I explained to Young Y/N what he'll need to do. Did any of you watch his fight?

Izuku: Me and Iida did.

All Might: Alright then you'll be the captain and the vise captain. Y/N please head to the location and prepare. *Y/N nodded and left* Currently Y/N will place 4 separate bombs in 4 buildings next to each other. Your objective is to find the bombs and beat Y/N so he can give you a code for their deactivation. You'll have only 15 minutes to do so. For now you have time to make a plan. Good luck.

While Izuku and Iida were explaining Y/N's abilities that they knew of, Y/N was almost finished with setting up the bombs. After he was done he headed to a center between the 4 buildings and activated his Hundred.

Y/N: *comms* I'm ready.

All Might: *comms* Understood. *to students* Alright times up. Go go go!

The class ran off and split into teams just like by Izuku's plan. After a minute of standing and looking around Y/N spotted 2 hostiles behind him, via radar, and turned around. Immediately he was hit with a huge wave of sound. When he looked at the source he saw Jirou using her quirk with the help of a lot of speakers that Momo made while the said girl was holding a shield.

Y/N: Interesting.

~flashback to 1-A~

Izuku: So from what I understood we cannot use attacks that will help Y/N charge up and go into his "Blacksmith mode". So Momo and Jirou try attacking from the distance with your quirks to distract him so we can get into the buildings.

Jirou and Momo nodded though one of them had a question.

Jirou: Wait but what is "Blacksmith mode"?

Izuku: From what I understood from his fight, when he receives enough damage and energy from the attacks on his Hundred he will use that energy to activate that mode which possibly enhances his abilities so we cannot let him go into that mode.

~flashback end~

Y/N used his guns and destroys the speakers which made the girls run behind the building for cover.

Y/N: An interesting plan I'll give you that. Unfortunately for you I predicted it.

Suddenly 4 buildings with the bombs lit on fire though one of them was frozen a moment later. Then an explosion hit Y/N from behind which made him stumble forward for one step. When he looked back he was met with another explosion to the face. When the smoke vanished Y/N saw Katsuki and Shoto standing a few meters away from him. Immediately Katsuki rushed at him with explosions while Shoto made an ice dome around him and Katsuki.

Iida: *comms* We found bomb number one. Floor 8 last room.

Uraraka: *comms* We as well. Number 2 is on the roof.

Izuku: *comms* I'm running around the building but can't find anything on the upper floors.

Denki: *comms* It's on the third floor.

Izuku: *comms* Okay we found 3. What about the 4th?

Tokoyami: *comms* Dark shadow found it. On the 2nd floor first room.

Izuku: *comms* Okay now everyone go assist with the fight while one of each group stays near the bombs. But we need to hurry we only have 5 minutes left.

After a minute everyone arrived to where Y/N and the other 2 were but were shocked to see Katsuki and Shoto laying next to Y/N while the said person had his sword-guns aimed at their heads.

Y/N: Give up heroes! You've lost!

Denki: Never! Let them go!

Y/N: Hahahaha! Do you really think I'll do such thing? But I'll be honest thanks to your explosive friend here you've already lost.

Suddenly Y/N entered his Hephaestus mode and pointed his sword opposite from each other while they gathered energy at the ends.

Izuku: Everyone into cover!

Y/N then started to spin while his swords created lasers. By doing so he demolished the 4 buildings with the students and the bombs and they started to fall. While falling however the bombs blew up.

Izuku: No!

Everyone rushed to help their friends and free them from under the rubble but were shocked to see them unharmed and under an energy shield.

-scene change to the observation room-

Y/N: And that's why I hid 4 of my shields in the walls.

Izuku: So you saw through our plan.

Y/N: Yes, despite it being a decent plan it was stupid. Instead of guarding the bombs you could've did something much more effective. Can someone tell me what?

After a minute of thinking Momo raised her hand.

All Might: Yes young Yaoyorozu!

Momo: We could've took the bombs somewhere else.

All Might: Correct! While yes, your main objectives were to deactivate the bombs and defeat Y/N you didn't think of other things.

Y/N: That being your surroundings.

Iida: What do you mean?

Y/N: If this happened in a real city you would need to follow a new plan. Yes you could find the bombs but it wouldn't do any good as there could be civilians in the buildings and when the bombs blow up they would kill a lot of people.

All Might: Main objective of the hero is not only to fight the villains but to secure and protect the civilians. Your secret true objective was to take the bombs away from the civilians or to evacuate the civilians from those places.

Iida: I see.

Y/N: Well everyone I'll be going now. I still have plans. Good luck and sorry for hurting yall.

Izuku: Wait can I ask a question?!

Y/N: Sure but only one.

Izuku: What's your power?

Y/N: It's High Speed Regeneration. Now goodbye.

With that Y/N left the room and Izuku started to mutter a lot thinking about different situations and uses Y/N's power would be useful for.

~timeskip till next class brought to you by~

Currently Y/N was in a combat class taught by Glynda Goodwitch and Summer Rose.

Glynda: Are there any volunteers who would like to fight?

Yang: I would!

Glynda: Then please choose your opponent.

Yang: Him. *points at Y/N*

Glynda: Okay. Go and get ready.

While Yang left Y/N just jumped down into the arena and tapped on his watch 2 times. From it appeared his sword and he put it on his shoulder. Meanwhile Ruby immediately started to drool over the sword.

Ruby: Do you see it guys! That sword looks so cool!!

However she wasn't the only one.

Summer: Do you see it Glyn Glyn! It even has a built in engine!!

Ruby/Summer: That's so cool!!!!

Many sweat dropped and giggled from their reactions. Soon Yang walked into the arena combat ready and took a stance.

Glynda: Are you both ready? *they nod* Begin!

Yang immediately launched herself at him with her gauntlets and when she was close she went for a right hook but instead she his the flat side of Y/N's sword while Y/N took the chance and round house kicked her away from him.

Y/N: Not a bad punch blondie. Come on.

Yang rushed at him again but this time Y/N hit her side with the flat side and sent her cracking into the wall. When Yang got up and looked at the screen she saw that her aura was at 47%.

Yang: Why not hit me with the blade? Afraid to hurt me?

Y/N: You sure you want this? It'll hurt very much.

Yang: It's a fight! Go all out!

Y/N: Alright. I warned you.

Yang launched herself at him but to her and everyone's shock he appeared next to her slashed her side and sent her to the floor which cracked it and a dust cloud covered them.

Summer: 'How fast is he? I didn't even see him move'

When the cloud settled everyone were shocked to see Yang passed out on the floor with a big slash wound on her left side.

Glynda: Y/N Dimitrescu wins! Y/N please take her to the infirmary.

Y/N nodded and picked up Yang and ran off.

~another timeskip brought to you by~

Right now Y/N was on his way to team RWBY dorm to meet up with Ruby. Soon enough he arrived and as soon as he knocked the door was slammed open and Ruby grabbed him by the hand and dragged him in.

Y/N: Whoa calm down.

Ruby: *giggle* Sorry I'm just too excited. Anyways everyone the friend I told you about is here.

Currently Blake and Yang were laying on their beds and Weiss was as always studying. When they heard Ruby call them they looked at her and were surprised when they saw Y/N.

Yang: Hey you're that dude I fought. You gave me a nasty blow to the side.

Y/N: Sorry. My sword can slice through aura and that's why I didn't want to go full power. But hey you wanted it and I gave it to you.

Yang: I would like you to give me something else too~

Ruby: *blushing* YANG!!

Weiss: Ignore her. I'm Weiss Schnee, a pleasure to meet you.

Y/N: Yeah I know. I was at one of your formal parties.

Weiss: *surprised* You were!?

Y/N: Yup. Remember that very tall woman in a white dress and a big hat? *she nods* That's my adopted mother.

Weiss: What!

Blake: Adopted?

Y/N: Yeah, I never knew my biological parents and I've been adopted into several different families. I've been in this current one for a bit over 3 years now. Also I think I know you.

Blake: *nervous* You do?

Y/N: Hmmm, oh yeah you're the daughter of the chieftain of Menagerie. Blake Belladonna right?

Weiss: Menagerie? Blake are you a faunus?

Y/N: You didn't know? I mean how blind are you girls? Her bow literally twitches a lot. And bows don't twitch. *phone rings* Excuse me.

-Y/N POV-

I walked away into a hallway and when I looked at the phone I saw that it was mom so I picked up.

Y/N: [Hey mom]

Alcina: [Y/N this is a serious matter. You need to come back home right now!]

Y/N: [Whoa calm down. What's happening?]

Alcina: [There's this, man thing, running around the village and he already killed Heisenberg and almost killed Bela!] (My AU)

Y/N: [Oh he fucked up! I'm on my way]

I hang up and ran to their window and opened it.

Y/N: Sorry girls but this is a family emergency and I need to leave!

I jumped out of the window and activated one of my past lives powers and flew off.

~20 minutes later~

I was approaching the village and as soon as I flew over the mountains I saw my home. Castle Dimitrescu.

I flew to the entrance and upon landing I immediately ran inside. Upon looking around I saw Bela, Daniela and Cassandra sitting in front of the fireplace.

Y/N: What happened!?

Trio: Y/N!!

Bela: Y/N there's a man somewhere in the castle running around. He almost killed us three but thanks to the safety measures you made we managed to survive.

Y/N: WHAT!!

-3D POV-

Right now Ethan was running from Alcina but he then heard loud and fast footsteps behind him and when he looked back he was immediately tackled to the floor by a huge white wolf.

Behind the wolf Alcina showed herself but this time Mother Miranda was with her.

Miranda: Well well, Ethan Winters. Now what will you do?

Ethan: This!

He showed a stick of dynamite into the wolves mouth and its head exploded. However the wolf didn't fall over or even lessened the hold on Ethan. Instead he just regenerated his head which shocked Ethan greatly.

Alcina: Did you really think that would work?

Miranda: Y/N be a dear and finish him.

Y/N: With pleasure.

With his claw Y/N cut Ethan's head off and then burned his corpse to ashes with fire breath. After he was done he transformed back to human.

Alcina: Thank you for coming. I fear if you didn't then he would be able to kill us. He almost did so with your sisters.

Y/N: And he payed for it. Now let's go, I'll stay here till morning and then head back.

With that he and Alcina went back to where the girls were while Miranda went to do her own things.

-meanwhile somewhere-

???: Did you feel it?!

???: Yes my liege. One of the monarchs has been resurrected. What will be the orders?

???: Track the location and we'll head after them tomorrow. I can't let all the Monarchs be resurrected. They caused enough chaos when they almost ended the world.

???: Understood my liege.

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And that's done. Hope you enjoyed.