Izuku first magic tutor on Yuuei almost ends with a disaster, but the light suspicions about something hiding from the shadows has reaching All Might's ears.

Note: The very first version of Izuku's costume was a blending of the Dark Souls's Magic Warrior and the Gut's Berserk armours.

Rogue Teacher...

During dawn, Izuku was training on a Special Yuuei Facility located a few kilometres apart from the main site, under watch by a special team managed my All Might, also the Top Number One Hero, and his teacher Aizawa, the only vampire that was a Top Hero while stare the events unfolding of a young sorcerer vampire that was also a fresh rookie on first year Hero Course.

By a special invitation, a former Black Ops soldier and current magic caster, which codename was Metal Knight, was hired to assure a balanced formation of this green hair vampire.

Since it could only manage to stay only a week, the strange person with some robotic enhanced arms and limbs, once himself could face the newbie, then instead to follow Nedzu's plans, it use own recipe to make a hellish rush training.

Along the first week of Yuuei classes, Metal Knight was supposed to focus on Signs spells, and probably to enhance the Magic Arrows casts, but his bad temperament leaves to push more of the Dark Schneider's grimoire.

"Since I don't have much time to enjoy...", Metal Knight makes a strange glare, while hold his robotic fists, "Why I don't introduce my special Black Death Commando Way of Training ?", he cites the former Black Ops Unit that he once worked.

Izuku don't have even time to react, once receive a direct hit air blast, but have enough time to cast the Quen Sign to reduce the damage, "What… are… you… doing ?! Bastard!", Izuku gritted his teeth, and even bite his lips with their own fangs.

Aizawa reacts with great disappointment, while All Might notices the odd behaviour from the guest marine. "This men is not follow the recommend methods!", yells Aizawa, "Hey! Great Demeanour Bastard! You shouldn't push Midoriya beyond the safety line, just for pleasure our teasing!"

Metal Knight then casts a paralysis field that blocks the two Heroes, "You should hold silent a little time...", and continues, "Let's begin!", and sends a barrage of punches against the green hair vampire.

Izuku face darkens, and focus on this insane teacher, "I won't lose to insane monsters like you!", and blocks the barrage with a uppercut right leg swing.

Soon the fight changes sequentially, from a minute of pure physical fight, leaving great damage on the training site, to another one or two minutes of magic casts. Izuku could even cast the Dark Element Magic Arrows with great destruction, "Barrage Target Lock! Gather… 400 Dark Element Spirits!", and sends directly to Metal Knight, "Magic Crossbow Barrage! Fire!", and the arrow barrage was so powerful that even the retired marine cast another shield, some of the stronger arrows break through the barrier and inflict some physical damage.

Luckily the damage received breaks the enchantment that holds Aizawa and All Might on a corner, and then both of two would try to stop the insane fighting.

Izuku then use the Igni Sign to send a continuous stream of fire, like a flamethrower, which indicates that the vampire was evolved that Sign to the next level. This was a breakthrough after 15 minutes of magic and enduring fight that reaches that point:

" This is nothing! ", says Metal Knight when casts a magic barrier to shield the Igni Sign casting.

" Then I cast this!", says Izuku, when cast a lightning bolt, "Seek! Spirits of Lighting!", and flares coating the electrifying bolt, "Destroy! The Blood Fire of Death!", and sends the bolt like a kind of blast, "VOIVOD!"

The blast had a huge piercing effect, capable even to blast the metal shield of Metal Knight, but luckily it was a relative weak spell that can be tuned to make non-fatal injuries, where Metal Knight himself notices, "I'm thinking that the Voivod are reasonable to use on the next Basic Hero Training class, on the next Monday!"

"A lightning spell cast ?", Aizawa frowns, "At last Kaminari would not be alone!", the 1-A class teacher makes a poke reference about the Electrification Quirk student.

But All Might was very worried of the Midoriya's powers, since it could defeat himself easily, but he knows by some strange rumours of a recent takeover of an infamous villain organization by dark sorcerers, and the potential unthinkable menaces that could follow was the perfect excuse to Metal Knight force the young vampire to unlock all potential, instead to restrain his development on safe techniques.

"And another of this insane stuff!", All Might was surprised when Metal Knight press a button to release an entire army controlled by remote control, including six heavy modified giant robots similar to the zero-point test robot, but with howitzers, ground-to-air and ground-to-ground homing missiles and even a prototype of a 5 megawatt plasma cannon capable to blast middle yield long range missiles.

The insanity was not ending here, since Metal knight manages to repair the decommissioned Second World War German tanks Maus, with 200 mm cannons, and finally two dozens of remote controlled armoured tanks equip with heavy machine guns, 50 mm cannons and batteries of short-range missiles.

The canvas fabric scattered along the battle field along some trash was after a decoy to hide the mechanical army until they receive an order to attack.

"First Strike!", Metal Knight activate all the weapons, sending a full barrage of shells and mortars against the place where Izuku stands.

Izuku blasts to himself intended to fly high, and to divert the shrapnel and blasts using the Geralt's Signs to shield the attacks, but only the Heliotrope could shield partially the weaponry barrage.

"Honestly! It's pure madness!", shouts an angry Aizawa.

Izuku tries to use the Exodus and Venom spells, but the very fast activation speed of the six plasma cannons disrupt the concentration and meditation required to manipulate the vitality flow and summon those signature deadly magic spells.

Even so, Izuku could cast another low-level, according from his own Grimoire classification ranking, spell, but it only blasts the missiles and shrapnel, but not the steamy plasma fired by the prototype weaponry. At least it was worth to try, "Skiss! Skurat! Shumega! Eni-Ono-In! Release the endless fire and brimstone from fiery Hell!", and blast a sequence of energetic pulses which resemble blades, "SODOM!"

"Very well! You can die now!", grins Metal Knight, "Full Attack!", and everything fires to almost randomly directions, beginning from machine gun barrages swing to all directions, and ends with flying missiles that tries to targets Izuku.

The Quirk Assessment Test on their first day was after all by some great use, it was the obstacles course test on steroids, along with live ammunition capable to wipe out a entire small town from the map!

"If the Yuuei motto is Plus Ultra...", grins Izuku, "Then this reception of doomsday is Plus Ultra on Hellfire Steroids!"

Once Izuku speaks that remark by pure defiance, he face a laser guided ground-to-ground GBU-39 guided against him and was too fast to Izuku simply run, forcing to use a Aard Sign blast to destroy the missile.

Then a barrage of MGM-140 ATACMS, plus a sequential firing of BGM-71 TOW from the heavy armoured tanks was automatically launched. The magnitude of this act makes Aizawa and All Might inner thoughts boiling until burst to a murderous demeanour.

Aizawa rage was beyond any conceivable scale, since it lauds as he could curse the Devil himself, "WTF is this little prank, dreadnought hero ?!", and starts to run with a black pitch haze on his right fist against the Metal Knight, "Since when a hero training fight involve anti-tank or piercing weaponry ?!"

"Oh, Oh!", Metal Knights screams, "The Central Command goes berserk!", the computer that controls remotely their toys crashes, and then everything starts to unleash to every conceivable target.

"This was to far along!", screams All Might, "Texas SMASH!", and Metal Knight was hit by a powerful punch.

"Goes Berserk, right !", and Aizawa does a similar punch.

And Metal Knight flies away from the Ground Site, while Aizawa makes an emergency call to the Main Office about the insane situation.

Aizawa's Phone Call:

"Mister Nedzu! Aizawa here!", he explains briefly, "That Metal Knight bastard brings an entire remote controlled infantry army just to test Midoriya's power!", and yells, "I manage to defeat that son of hell, but that crap fails, and menace to destroy not only all Yuuei Campus, but all the neighbourhood town! "

Nedzu yells when answer the call, "You just said that an entire remote controlled infantry division, have a software glitch that takes it off control, and that stuff was secretly assembled by Metal Knight ?!"

"If necessary, make an emergency call to the Japan Self-defence Force! Or the Department of Defence! This stuff in less than one minute will even fire six plasma cannons!"

"First of all, I will fire and put Metal Knight on jail...", and Nedzu pauses a little, "However, I cannot do such request to the military, just because it is not possible to request a missile strike against our school, in less than one minute!"

The Real Final Assessment Test!

Aizawa grins when closes his own smarthphone, and then yells loudly to Izuku, "MIDORIYA! This is the Real Last Assessment Test! Go Beyond and Plus Ultra ad infinitum!", and gasps, "Destroy and Raze that Army to Nothingness!", ending with a comical reference from Hellsing franchise that make Izuku perplexed, "Search and Destroy! Ahem... Raze and Destroy!"

Once Izuku receives the desperate request from the older vampire, his mind flashes about a page of his own grimoire that brings a real motivation to recites a new thing, a Ritual Summoning Cast, to release the powers of Witcher Signs as a foundation to a more powerful magic spell, which is the most powerful that Izuku could ever manage to cast, but could be heavily costly.

However it have a duty to save not only Aizawa, or All Might, but the entire Yuuei and the nearby town citizens from the berserked Metal Knight's army.

The plasma cannons will be fired in less than 50 seconds, and without haste more time, Izuku holds a strong grip on his entire body, and meditates to release his powers, and then chants briefly.

"Magno animo vinculum inter caelum et inferos antiquis... Sit vetus testamentum Tenebrosi Cicero!", where Izuku speaks the Latin name of Dark Schneider to use their ancient link to request their hidden powers, "Magia Erebia liberatio!... ", releasing a giant circle with runes along the boundary, due to Izuku's own native black magic, that him align the centre of the circle around the target, "Qui excieo septem antiqua incantamenta ab Lupus Alba ...", and places all seven Geralt's Signs powers on the ritual circle marks, "Et sanguinis sacramentum signum!", while drains his blood to seal the Ritual Signature. It takes 40 seconds to finish the Ritual Enchantment.

This Ritual Spell enables to Izuku release more from his magic vitality than the normal, thus making a Limit Breaking Spell, in exchange to the greater risk to cause several damage, while enables to cast a dangerous and powerful magic spell:

"Hear me, the dark ones! Hear me, the void!", one he starts the main incantation, the Ritual Circle enlarges to cover the entire battle field, also protect Izuku from the damage, even he was outside the magic circle domain, "OH! The Great Obscure Flames of Chaos! Under your Dark Pantheon, I pledge your Deathly Sacrifice!", meanwhile the ground shakes due to the increasing magic energy release, "Awaken the Great Chaos of Underworld and the Omnipotent Inferno of Darkness!", then lighting, fire, ash and ominous miasma flows to a newly open gate from Hell, from the middle of the magic circle, just to encircle the Metal Knight's army, "From the Hades flames and Sabbath lies… Eternal Idols of Heaven and Hell, Paranoia Dreams that never Die... Guided by Iron Man's cast spell!...", finally Izuku manages to release a dark flare of dark energy, once he drops his casting hand to the ground, that cracks and breaks apart along the darkness miasma, while quickly increasing the temperature, and starts to destroy everything in their path, "Under the Dark Pact of Chaos… Release the Hades flames! Dai Idol! Dai Omni! Gizeh! And brings everything destroyed by the Nuclear Doomsday!...", and quickly the miasma grows hotter and hotter, reaching the temperatures of several million degrees, and soon it begin to reach the critical point necessary to start a nuclear reaction, blasting like a nuclear cauldron, "BLACK SABBATH!"

The last Izuku's magic works due to the magic magnetic field created and guided by the Ritual Circle along the darkness miasma flux. The black magic energy also helps to kick an initial adiabatic heating that reaches an initial temperature of about 10000 Kelvin. Once Izuku spell opens a gate from the Hell, the caster should use this event to compress the dark energy, and with the help of the magic magnetic field described before, it reaches quickly the pressures and temperatures required to do a nuclear ignition, releasing huge quantities of nuclear radiation, thermal heating, convective heat transfer, ending with an huge and catastrophic shock-wave. At apex, the temperatures reaches about 100 millions Kelvin.

For the Aizawa and All Might perspective, they witness first a giant firestorm of black flames, followed by a kind of nuclear blast that was beyond everything the Yuuei witness, followed by a white and blinding light and a thermal wave much similar to a detonation of a nuclear weapon, while the entire Metal Knight's robotic army was simply destroyed in less than one second.

The Ritual Barrier helps to deflect and shield the explosion shock-wave directly to sky, avoiding the nearby city and the Yuuei Campus itself from blasting away, but it couldn't avoid several broken windows, and other minor damages.

Some seconds later, all was once a Special Training Field was now a crater, and an atomic mushroom cloud. By some distance witness, the ultimate Izuku's spell was a magic crafted nuclear bomb !

In fact, even it was late evening, many citizens on the nearest town around the campus would through than an atomic bomb was just detonated on Yuuei High School facilities. Quickly the media storm the site, asking about the nuclear test, before the Japanese Army (SDF - Self-Defense Forces) arrive, and isolate from further civilians and spies, using force, if necessary.

Some surviving sensors record the entire fight and the Black Sabbath spell effects, including the fact the energy was roughly equivalent of a small tactical nuclear weapon, reaching a 10 kiloton yield. Even Izuku's body had an inhuman resilience against several phenomena, the last magic spell causes huge body bruises, and broken bones. Since his teachers was very quickly to react, about a minute later, Izuku was sent with Aizawa help to the Recovery Girl's Infirmary, where take an entire day just to recover.

According by Aizawa or even Nedzu own judgement, the Metal Knight's actions was beyond the ethics, and was straightly fired without second thoughts. After all, the ultimate Izuku's spell that just delivered a catastrophic destruction of Yuuei's propriety , much incited due to invited tutor, reveals the true danger of a powerful sorcerer. The next problem to Nedzu fix, is to convince the personal with metal brasses to not make much fuss on Yuuei own business, even he knew that Izuku would be a terrible asset on military hands.

Next day, the Yuuei decide to hire a new magic tutor, and to avoid more mistakes, they decide to use their resources to convince the same Izuku's private magic teacher when it was younger to apply, and she's accepted without great problems. The choose was also driven by the Izuku's mother own request, which also barely could sleep on that night.

At the beginning of the Next Week...

At the next Monday, the entire 1-A class reunites as usual, but that day was a little special since they know that after the English class, and the lunch break, they have the first Basic Hero Training class. Everyone have high expectations, and once they gather together, some students like Bakugou notices the little daze, and little health frail from Izuku, prompting a question, "What's happened ?!"

"Well!", Izuku sighs, "Recovering from an insane psychopath disguised as teacher!"

"WTF ?!", yells Todoroki, who notices the conversation, "It was from your Special Classes ?!"

"An obscure sorcerer tries to tease me, and after some degree of insanity, this ends like a nuclear war!"

Both classmates turn his heads, and becomes anxious.

"What kind of disaster was that, and how it ends?", asks Iida.

Izuku places his smartphone, and display pictures of the Metal Knight's infantry unit, and the results of his actions, which was a picture of a huge crater and a mushroom cloud.

Everyone was shocked by that result.

" That psychopath, instead to teach me how to control my powers, they want to pull all of it, and then decide to assemble an entire robotic army, using heavy weaponry, including the experimental plasma cannons", causing Todoroki to etch his rose-and-white coloured hair, "And enough ammunition to raze this site and neighbours to the ground."

" This explains why such blast cause a massive panic on this town!", says Yayoizuru.

" All Might and Aizawa takes down that crazy men, and he was fired a couple of minutes later. But the entire robotic army loses control, and I manage to use the most powerful spell that I could summon!", and pauses a little, "And, men! It was too costly!"

Katsuki was a bit worried, "And what kind of spell was that ?"

"Black Sabbath! A magic spell conceived for total destruction of any sorcerer's surroundings...", Izuku said while play with his hand, ignoring his classmates thoughts, "Since it was a Forbidden Rank Spell, I use first a Ritual Spell to unlock seals from the Dark Schneider and Geralt of Rivia bloodlines, which require to use my blood as my signature... And once finished... I could spell that thing !"

Todoroki then asks, "It is another fire spell ?"

"Actually, it was a Dark Magic Spell, but had a fire foundation.", and sighs again, "But in reality it is a kind of Nuke spell", where all classmates became frozen, "And I almost fainted after the spell cast. Aizawa-sensei says that fire was reached several millions of degrees Celsius!", and cites the energy release, "And an energy output equivalent of a small nuclear weapon, that's about 10 kiloton...", and concludes, "But it breaks my own limits, since I spend the entire night on Recovery Girl's infirmary just to heal my own body!", and finally relaxes, "And fortunately all stuff cools down quickly!"

"10 kiloton ?!", Katsuki yells, "That's almost half the energy release by the Hiroshima Nuke!"

"What's a real forbidden spell!", Tsuyu pokes.

"The story is so unrealistic that makes anyone peck, thinking that was some kind of weird dream!", says Yayoizuru.

The classroom atmosphere shifted, once the Electrifying Quirk user intervenes.

"There's something odd, and curious about you...", Kaminari said, "After all, names like Black Sabbath, Megadeath, Sodom, Venom, Exodus... and such makes to think..."

Katsuki also stops to think, while only thought to himself, "In reality, I'm curious about Deku choose such weirdness when use their WTF powers..."

"Why your powerful spells had names derived from Heavy Metal bands ?", asks Kaminari.

His entire class snaps from that trivial knowledge, "Oh! It is true!", while search on this phones.

"It was because my natural-born vampire mother, once they discover that was awaken as a sorcerer, she had the correct and wisdom suggestion to hire a private tutor... And now she was also hired to teach me the extra-curricular Magic Arts classes!", and explains the rest, "During the Junior High School years, she when helps me to translate ancient Germanic books, she had the suggestion to place nicknames based on Death Metal or Heavy Metal bands, since she was a huge fan of Heavy Metal!"

Once Izuku finishes his explanation, Present Mic arrives to start the English Class, and everyone focus switches to his lecture.

The English class was so boring for much of Izuku's mates, but aids to recover some of the animosity when both goes to the main Yuuei's cafeteria, the Lunch Rush.

On cafeteria...

The rumours about a student vampire was reached almost all classes, albeit the mandatory discretion. Soon, some of them could spot the green-hair as the famous vampire, specially the General Education's brainwasher quirk user, Shinsou.

Shinsou was generously surprised about the fact a vampire could eat human food, but if it was bloodied the better it tastes. Izuku also receives stock blood to drink, and since it couldn't drink that stuff unnoticed, soon the regular vision of someone drink blood would cause some nauseas to some of his peers.

"Well! It is strange that a bloodsucker eats normal food!", says Shinsou.

"I'm also unaffected by garlic or other non-sense", Izuku replies, with a sharp voice tone.

"I'm feared because my brainwashing quirk, and you?", Shinsou also tries to pull more info.

"My very frightening quirk", Izuku plays a little, "is called… Vryko-Warlock!", but he know that he also have a kind of brainwashing Sign called Axii, and eventually the Somne.

Shinsou mind snaps, due to the strange name, "Your parents don't had better ideas ?!"

"I like that name", even in reality was indifferent, "Since I could cast several fire techniques!"

"Very odd", Shinso was unconvinced, since he notices that his brainwashing quirk was no effect due to Aard Sign that Izuku discretely casts before starts his meal, "Vampires are really through stuff!"

And then Izuku lefts the table, while Katsuki pokes about the whole situation, "Stupid nerd! Please, do not talk so openly to other classes! They want to know your real powers!"

Izuku answers, "That Shinsou knows more that it speaks, but I discovery that the Aard Sign nullifies his quirk!", and adds, "By the way, the Axii is very equivalent to the Shinsou's quirk!"

Katsuki agrees, but warns Izuku, "Deku! But try to not use unnatural magic, or everyone will be afraid!"

Returning to the classroom...

For many of 1-A class mates, the initial frightening fear was gradually melting, as they notices by the last Saturday incident, that Izuku powers, even beyond some of the best Top Heroes, has not infinite or neither was a God. Izuku speaks that his magical powers may take an entire mouth to recover totally, but even so it may be enough to handle the Hero Training Class.

And then the star of Yuuei, All Might, arrives on the classroom, "I'm arriving here like a normal person!"

Everyone, including Izuku, raise from his chairs and applause.

"Today is your first Hero Training class!", All Might smiles, and displays a vault with 20 boxes, "And all of your Hero Costumes are finally ready to use!"

Everyone join the fray, and goes to the Custom Lockers with their suitcases. Katsuki was already dressed his Hero Costume, where the giant gauntlets resembling grenades was one of the visible and intimidating features. In reality was waiting to saw the Deku's Hero Costume, and once exit, while drink another blood thermos, intended to replace the depleted vitality due to the Black Sabbath's Forbidden Spell. And the vision of the Izuku's costume makes everyone, even Katsuki that was a little mesmerized, and the rest of mates astonished.

Izuku's Hero Costume was more like a medieval armour, almost dark gray coloured, with metal plates reinforcing his torso, legs and arms. His shoulders has heavily reinforced with dragon motif pauldrons. The rerebrace, couter and vambraces was made with a steel alloy, and several alchemical symbols was etched along the cited armour plates, including a etched black dragon running from the shoulder to his hands. This will make his arms act like a magic wand, to enhance and increase the precision of his magic powers. The gauntlets has less armored, to enable Izuku cast his Witcher Signs, or another spell at will.

His legs was also covered by metal plates, where the cuisses, poleyns and greaves was also etched in the similar way as their arms. A steel reinforced booths replaces the sabatons. His main body was also shielded, with a multi-layered breastplate and plackart. But those parts was hidden by belt strips to house throwing knifes along the armoured torso. And finally, on Izuku back, a giant sword that serves as the real magical wand was placed here. The sheer size frightens some boys. Finally a black cape with some enigmatic heraldic seal etched along it, completes the Izuku's Hero costume. The helmet was retractile, and so it maintains open.

But since Izuku's armour are modular, for the time being, it could remove the sword and other weapons, since it will not need to use anything of this. At last, the first real Hero Lecture will begun...

To be Continued...