Izuku the Catalyst

by Alphasix321

OFA triggers the activation of Izuku's latent original quirk. And it's a powerful one at that. The throne of heroes, which allows Izuku to summon various powerful artifacts and even the heroic spirits themselves...While suffering through the pains of gacha. Alaya giveth, and Alaya taketh away. Pairings to be determined.

1. Gacha is good civilization?

Yup, I'm finally doing it, I'm finally putting this, along with a few of my other ideas from the Reading fic in writing. I'll warn you again, I won't be updating any of these new stories very frequently if at all, however, anyone is welcome to take up the ideas found in these new stories and make their own.

Again I only ask for you to give me credit for the idea and maybe a link to my version of the fic in the A/N of your first chapter. Thanks in advance for keeping up your end.

Oh, and I changed the timeline to this story slightly. Izuku now inherited OFA two days early, nothing more nothing less. It doesn't do much other than give him a day to test it out(breaking his arm and visiting Recovery Girl early in the process) and wake up the next with his original(Throne of Heroes) quirk. Otherwise, he'd show up to the testing grounds with a brand new quirk out of nowhere which wouldn't bode well.

A 14 year old Izuku Midoriya woke up like any other day. However, today would change his life forever, even more so than his chance meeting with All Might. He looked up seeing an ethereal blue message box in front of his eyes.

The box read: 'Hello young master, I am an aspect of your new quirk; The Throne of Heroes. It's a pleasure to meet you' The words said, a female voice appearing in the young man's head as he read them...It took a while for the information to hit him but when it did his eyes shot open in an instant.

"Oh great, I played for so long last night that now I'm hallucinating." This was a new one, although not very surprising considering his hobbies. He always loved video games, especially RPG's based on battle. Mostly because it let him take the reigns of a hero, something his former quirklessness would probably never allow. Even after inheriting One for All, he didn't have the heart to just give up the hobby outright.

'While your reaction is understandable, this is not a hallucination. I am an autonomous, artificial intelligence created to help you have a better understanding of your new quirk. While it may be true that this quirk is not natural to you, like the one that the Johnny Bravo lookalike gave you, it is yours nonetheless.' The screen changed as he read the message. Now instead of a text box, he saw three different white boxes.

The first had a symbol that looked like a Roman cross with a circle in the middle colored in blue. Under the box, there was the word "Summoning" The second had a symbol that looked like two pyramids inside each other one pointed upward and the other pointed downwards. This box had the words "Shop" written under it. Finally, the last box had a symbol shaped like two hands holding each other. This one had the word "Friend" written underneath it.

"This is way too realistic, not to mention self-aware, to be a hallucination. And if someone had enough free time and the right quirk to pull a prank on me, then they certainly wouldn't know about One for All." Izuku rationalized. He focused on the Friend tab and the screen changed again. This time showing a section of rows, only two of which were filled in, the first had a portrait of Bakugou and his name written right next to it, likewise with the second except it was of Inko.

'This is the Friend screen, here you can see the information regarding those that consider you to be a friend and vice versa. Friends appear automatically once you have met the prerequisites needed to be considered their friend. You can see the status of your friends by focusing on their icons mentally.'

'It can't hurt to try' Izuku thought as he focused on Bakugou's portrait. The moment he did this a profile appeared with information on his friend's status, including his mental state, his physical condition, and even his location.

'This alone is incredible, having such detailed information on someone so easily available. What about the other two boxes.' As he thought this the screen went back to the original three boxes. This time he focused on the 'Summon' tab and the screen changed again. This screen had the portraits of several people that Izuku didn't recognize, under these portraits were two buttons. The first said single summon while the second said 10x summon.

"...A gacha game, my quirk is a fucking gacha game." Izuku said with a twitching eyebrow, he usually wouldn't curse but come on! With a situation this ridiculous, he probably deserved to be cut some slack.

'Welcome to the summon tab! Here you will exchange saints quartz, summon tickets, and friend points to summon various helpful items, powers, and even servants.'

'Servants? Like actual people, or maybe something like ectoplasm's quirk?' Izuku thought in confusion.

'Servants are powerful creatures that can be summoned by a variety of means. Your quirk being one of them. Each servant is a copy of a legendary figure from history called from the Throne of Heroes to fight on your behalf. Beings such as the Minotaur, Medusa, King Arthur, and even demigods like Herakles can be summoned here.'

'...I don't know what to say to that. Also saints quartz? Summon tickets? What are those? And how is the Minotaur considered a hero? Or Medusa for that matter?' Those two in particular didn't exactly scream hero to him.

'The definition of Hero is rather flexible. As for your first question: they are all different resources used for summoning. Saints Quartz are both the rarest, and the most common. 3 saints quartz are needed for a 1x summon and 30 for a 10x summon.' The Ai explained, showing him a picture of what one of these looked like.

'They can only be obtained through three methods. The first being the hardest, by completing various important hidden quests that are created as life goes on you will be given a saint quartz each.'

'Hidden quests? So unlike a game, I won't be made aware of them. I guess an example of an important quest would be becoming a hero or getting into a good hero school.' Izuku reasoned.

'Correct! In fact, you've already completed quite a few quests. I'll give you your rewards after the tutorial is completed so don't worry about that.' A winking emoticon appeared in the text box, well that's nice to know.

'The second method is much simpler, every day you will receive a free saint quartz, at the end of each week, you will receive two instead. Each birthday you will receive an allowance of 60 free quartz to use as you please. The third and final method is what makes them the most common. You can buy them outright using real money with the shop option.' The Ai explained as Izuku absorbed the information.

'Additionally, saint quartz can be used as healing items, consuming one can completely reset your stamina, or it can bring every member of your summoned party back to full health and power instantly.'

'Next are the summon tickets, they can be earned through the first two methods. You will either receive a single saints quartz or a summon ticket daily. They can be earned through quests as well, and they allow you a free 1x summon.'

'Finally, there are friend points. These accumulate daily, for each friend that you have you will receive 200 friend points each. These points can be used for friend point summons. Friend point summons can only be done with friend points, additionally, they provide a limited number and variety of items compared to the regular summons.' A quick list of possible drops showed up before quickly disappearing behind a newly formed info tab on the bottom left of the 'screen'

'You get one free 10x friend point summon every day, each 1x summon costs 200 friend points and every 10x summon costs 2,000' The ai finished explaining. 'By the way master, you can speak to me through your thoughts. This system was designed to maximize convenience.' The voice finished his/her explanation.

'I think I understand so far. This really is a unique quirk. Who gave it to me? And what do I call you?' Izuku asked the voice. She appeared to be benevolent so far, so he hoped that she could give him some answers.

'Ah! How rude of me, you may call me Mashu. I was sent here by Alaya, they are the manifestation of humanity itself. And as you probably know, one of humanity's greatest motivators is boredom. And as the manifestation of ALL of humanity, Alaya's boredom is legendary. To cure this boredom they have gifted you this quirk.' The newly named Mash explained, shocking Izuku further that such a powerful being would take interest in him.

'But why me of all people?! Shouldn't this kind of power go to a hero like All Might?' Izuku asked, not understanding why.

'The quirk was supposed to go towards the person who was the least likely to harm humanity with it, along with being the most likely to use it for humanity's benefit. You were that person. That makes you an official part of the Counter Force! Congratulations Master Izuku!' Izuku blushed at this finally realizing that Mash has been calling him master this whole time.

'Can you please not call me master. It kinda feels weird, besides I'm not above anyone, including you.' Izuku requested, to Mash's surprise.

'Very well Izuku-kun. Thank you for treating me as an equal. Most people wouldn't give me the light of day since I'm not "Real". She replied with a thankful tone.

'Of course, regardless of whether you were born naturally or made artificially, a person is still a person and deserves respect.' Izuku said resolutely.

'A-anyway we should get back to the tutorial. As a start you will be given a free 10x summon, it will give you a guaranteed rare servant along with the chance to obtain more if you're lucky enough. Please roll now so that we can continue.' Mash continued, hoping that her new host didn't notice the stutter.

Izuku did as he was asked. When he mentally pressed the button there were several flashes of light with cards appearing on the screen. Some had people in them, and the rest had items. By the end of it, he had 10 cards displayed in order of appearance, some were gold while others were silver.

'Here are your new summons Izuku-kun, allow me to explain them to you. Detailed descriptions are available to you but I'll give you a short summary of each for the sake of time. May I say you are quite lucky with your first summon, this many gold items are very rare. And acquiring two golden servants in your first role is particularly impressive, the chances of that are in the single digits!' Mash exclaimed energetically before going back to her explanation.

'I will start with the silver cards, they are of the three-star rank, and the least valuable of the cards that you can get from the regular summons.' She explained as she went over the card with what looked like a magic symbol on it.

'This first card is the craft essence called Hydra Dagger. A poisoned blade with a coating of venom extracted from a young hydra. Said poison causes excruciating pain upon entering the body, and is oftentimes lethal. Use with extreme caution.' ...Ok, Izuku wasn't even going to touch that. He really hoped there was a way to sell these things or something.

'There is don't worry about that Izuku-kun. Some of these items are indeed a little much so don't feel obligated to use them if you don't want to.' Good, very good. He really wouldn't want to use something like that, it sounded positively villainous.

'Next is the mystic code Motored Cuirassier. A large motorcycle, armed with the magical energy converted from the King of Knights. Simply put, it's an amazing vehicle that surpasses all of its contemporaries in sheer speed.' Another item Izuku couldn't really use, though he wouldn't lie he'd probably keep it for how cool it looked alone.

'Your next card is...Oh my. It's a love potion. Let me explain. It's essentially a real version of those pheromone perfumes you see on online ads. Dab this on yourself and you'll experience a temporary boost to your looks and overall likeability with the opposite sex, alternatively, you could drink it and obtain a lesser, yet permanent bonus instead. Have fun with that.'

'I must not give in to temptation, I must not give in to temptation, I must not give in to temptation, I must not give in to temptation, I must not give in to temptation, I must not give in to temptation.' Izuku gave into temptation almost instantly, grabbing the card with his hands which caused a potion to appear within them which he downed immediately. Blushing the entire time. 'Hmm, cherries.' It tasted good. The flavor and what it meant for him as a person.

'...I can't say I didn't expect that. Not that you needed a potion to get girls to like you, just have some confidence in yourself Izuku-kun! You're plenty cute enough as is!' Izuku's blush multiplied in intensity while Mash continued with the rest of the cards since they didn't have much time.

'Next is your first gold card, the Holy Shroud of Magdalene. A shroud that once worn protects you from the attacks of any male, quartering their effectiveness. It also passively exudes a holy aura that calms the faithful. ' Mash explained, the next one quickly since it was rather simple.

'The final craft essence is rather special, instead of giving you an item it gives you the knowledge on how to perform Formalcraft, a type of magic which uses the Earth itself to supply the energy rather than a person's own reserves, of which you have none so it's doubly useful for you.' That sounded incredibly useful! And painful, how were they going to cram so much information in so little time?

'The information will be introduced gradually over the course of 5 years so don't expect to be a master overnight! It can also be studied via meditation for quicker results but again, don't expect a miracle.' As she finished explaining information slowly started to be streamed into Izuku's head, slowly enough that it wouldn't bother him in his daily life but still noticeable when he focused on it.

'Finally, we can get onto your first servant. The three-star Rider: Alexander! King of Macedonia. His stats and what they mean can be found in the detailed description on his card, but before that, I need to explain just how servant cards work with your quirk.' Izuku listened closely, only having enough time to slightly gush over having such a famous figure in his collection.

'Servant cards can be used in three ways. The first is the most basic, Noble Phantasm: Include. This allows you to use the most powerful weapon/ability of each servant on its own. Next is the ability of Servant Merger: Install. Which installs the abilities, techniques, and even combat knowledge of the servant into your own body, however only about half of the servant's true power is transferred over.' So far so good, and all in all it sounded amazing already, though Mash's voice took a more serious tone for the third option.

'Finally, there's the full summoning option which summons the servant to your world in their full glory. This option has the potential to be extremely dangerous since not all servants will take kindly to being ordered around.' Izuku nodded, it made, especially if figures like legendary kings or even anti-heroes were to make their appearance, prideful or outright malevolent beings like that wouldn't take orders lying down.

'To help circumvent this we have provided you with three command seals, they can be used to order your servant to perform any action once per use without question. However, you only receive one command seal per day so use them wisely. They can also be used to heal or power up your servants but the latter is temporary so it is suggested not to rely on it.' Another amazing feature, and a necessary one from what Izuku could see, he'd take that advice to heart.

'As for Alexander, as a Rider class servant his specialty is in movement speed and his powerful Noble Phantasm: Bucephalus, a large dark horse that with the strength and ferocity of 50 men. It can easily match up to modern-day military vehicles in terms of strength while being significantly more maneuverable. He's a good boy when you get to know him.' A horse? That was...Strange but he could see the use in it. Wow, this quirk was gonna turn heads when Izuku revealed it.

'Indeed. Now, onto the next servant: Ushiwakamaru, a name you may know from history class.'

'...Wasn't he supposed to be a man?' Izuku thought to himself while blushing profusely at this servant's clothing...Or lack thereof.

'History isn't always accurate, she is also a Rider class servant so you already know her specialties. As for her Noble Phantasm, it is Dan-no-ura ・ Hassou Tobi A powerful secret technique which temporarily raises your agility and speed to the levels of the original servant, effectively doubling it for a few seconds.' An incredibly useful ability, though limited in its usage Izuku could easily see the benefit of having a way to double his speed out of nowhere.

'You're final silver servant is caster Mephistopheles. Thankfully history was wrong about this one too, he's not a demon, just an artificially created human. A word of advice, please don't summon him, he's like 5 levels of crazy and all of them are lethal.' No need to tell him twice, the guy frankly looked terrifying anyway.

As a caster, he focuses on ranged damage dealing and a fast-charging Noble Phantasm. Said NP is called Tick Tock bomb, a series of small, spider-like explosive devices that crawl on their own towards a chosen target, detonating once they clasp onto said target dealing a moderate amount of damage and leaving the opponent cursed. Not to be used against squishy targets I imagine.' But great for durable opponents or for demolition, and if it's fast charging Izuku guessed that it can be used rather quickly one after the other.

'Finally, we've arrived at the golden servants. These are rather rare, only having a drop rate of about 4%, though one is guaranteed with each 10x summon. The first of which is Fionn mac Cumhail, a Lancer which focuses mainly on short-range combat speed and perception. His NP lets him gather surrounding water vapor to the tip of his spear and then shoot it in a straight line like an industrial water jet. You can imagine the results.' No kidding, an attack like that could shred through steel easily, definitely not something to be underestimated.

'The final card you summoned is the Archer servant, which as you can imagine focus on long-distance combat, though not necessarily with a bow and arrow. Any ranged weaponry can count. This specific hero is a bit unique though. He is also a counter guardian, CG Emiya to be specific, his noble phantasm is rather special and permanently affects the mental state of the caster so using it for yourself has been locked away, sorry about that.' Izuku was surprised and a little disappointed to hear that, but if this servant's power could permanently alter his mind...He could live without it.

'As a consolation prize you are to be given his five most commonly used weapons instead: The Black Bow, Kanshou and Bakuya, Caladbolg II, Rho Ais, and Hrunting. You may check out each individual NP at your leisure later on.' And he totally would, Izuku even recognized a few of those names from old legends and was surprised that a single hero had so many NP's. Just who was this Emiya guy anyway?

'That's all for now Izuku-kun, it's about time for you to start the day, if you even need to talk to me just think my name with intent, and I'll respond, have a nice day! And don't forget to check out your starting sum of quartz later in the summoning section!' And with that the screens vanished, Izuku just stood there, processing what had just happened.

Or at least he tried to until his mother called out to him before he had a chance to think. "Izuku-kun wake up! you don't want to be late for the entrance exams right?!" Came the voice of his mother, the most important person in his life.

'Right I should get going. I'll tell her about my new quirk later, it's going to take time for me to be able to explain it..' He thought as he made his way to the kitchen after doing his daily rituals. Inko was waiting there with breakfast and a smile.

"Good morning, Izuku-kun! I hope you slept well, today is a big day after all." Inko reminded him while setting up the table. Before Izuku sat down he gave her a morning hug as a greeting then began to dig into his breakfast.

"By the way how is the training going? You've grown so much in just a short 10 months, I'm so proud!" The mother exclaimed in happiness for her son's new resolve.

"It's been going really well. Yagi-sensei has done so much for me, I just hope that I can repay him eventually. Oh, I almost forgot, after the test today I need to tell you something, but it's complicated so I have to wait until later." Inko looked confused but accepted it.

"Ok Izuku-kun, I trust you, just have a nice day and we'll talk later." With that Izuku finished eating breakfast and went off to catch the train. 'Let's hope some of those NP's can help me out during the exams, I don't think I'm gonna be able to rely on One for All any time soon...' He thought, remembering his broken arm from yesterday.

And so began the first day of a new journey for our favorite cinnamon roll of a hero!