Reborn In Black Clover With Demon Slaying Magic

Running through the entire kingdom, the two boys left trails of blue and yellow lightning behind them as they played a brutal game of tag.

*ZOOM!!*

*ZOOM!!*

*ZOOM!!*

[A/n: Reminds of the Flash vs Zoom]

Through the streets, on rooftops and across walls, these two raced everywhere their feets took them.

During their game, Grim had proceeded to decapitate several elves that he came across while also slowly catching up to Lufulu who was starting to sweat bullets.

Since they were knights from different magic knight squads, he only spared them a glance before using [Thunderclap and Flash] in the way it was intended to be used. Decapitating enemies at high speeds.

Besides, if this came back to bite him later on, he could always say he was defending the kingdom from rebellious magic knights who threatened the kingdom's citizens. I mean who was gonna argue with him?

---

As the two continued to run, they eventually found themselves back at place the fight started.

'What the hell is wrong with this guy! Its like he's getting better at turning corners.'

Having ran for this long, Lufulu had already found the weakness of [Thunderclap and Flash] and planned to use it to escape from here. And while he wasn't exactly pleased at seeing his reincarnated comrades getting their heads cut off, his self preservation instincts kept him from facing the malevolent force chasing after him. He could always avenge his friends in the future, but getting out of here alive was his main priority.

Unfortunetely for him, the longer the game continued the better Grim became at fine tuning the spell allowing him to properly utilize [x8] when it came to turning corners.

Stretching his arm out, the palm of his hand touched the back of Lufulu's shoulder.

"Tag."

!!!

Hearing that cheerful voice, all the blood in Lufulu's face seemed to vanish as he understood the meaning behind that word.

But would someone whose waited for 500 years really give up after reincarnating for less than 24 hours?

[Lightning Magic: Thunder Fiend] .

With his grimoire flipped wide open and bursting with bolts of lightning, Lufulu's speed suddenly increased as he began ricocheting off the debris around the area.

'FIGHT!! I HAVE TO FIGHT TO WIN!'

As he begun to bounce around the area, the feeling of getting chased and the memories of his now dead comrades started surfacing in his mind as his speed started increasing even further.

'I'LL KILL HIM, I'LL KILL HIM, I'LL KILL HIM, I'LL KILL HIM, I'LL KILL HIM, I'LL KILL HIM, I'LL KILL HIM!!'

*ZOOM!!*

*ZOOM!!*

*ZOOM!!*

Whilst he was flashing from place to place, he didn't notice that his skin was starting to slowly darken as the actions of Grim starting pushing him into the depths of despair.

"I'LL KILL YOOU!!"

[A/n: Grim really is a menace isn't he?]

'This mana...'

Feeling his magic power starting to swell and expand, the sudden dark and sinister nature his mana was starting to take on gave Grim pause.

"NEVER FORGIVE." Lufulu said through grit teeth growing faster by the second.

"I'LL NEVER FORGIVE YOU!!"

*BOOM!!*

Releasing some excess mana, Asta, Magna and Vanessa who were watching from a safe distance started growing more and more worried as his mana waves reached them.

As if sensing the change in his mana, Grim's grimoire flew to his side and started pulsing with energy as he felt the power in his own mana suddenly grow causing the yellow hue around his body to expand.

While he didn't understand what was going on, seeing the change in Lufulu's appearance and mana, something inside him told him that if he continued to let whatever this energy was corrupt Lufulu any further, the chances of Luck coming back the same would vanish.

Having finally gathered enough momentum to point that his next attack would be absolutely devestating, he kicked off a nearby building a shot towards Grim with his lightning claw stretched out.

"DIE!!"

Using [Hyper Focus] and his newly enhanced lightning like reflexes, he stood motionless and looked at the claw approaching his face.

*Deep Breath*

Facing the attack with a completely clear and focused mind, he put his arms up. Using his forearm to deflect the blow, he mercilessly drove his knuckles into Lufulu's throat with lightning fast speed and precision!

"UGH!"

With his eyes glowing a dangerous yellow color, Grim felt his heart beat accelerate as flashes of lightning streaked all across his body causing every action to feel... electrifying.

Unable to hold his smile back any longer, he pulled back after stricking Lufulu's throat since he came up with a fascinating idea.

Since he needed to stop the corruption from spreading any further than it already had, wouldn't it naturally stop if he was no longer conscious to allow it?

Watching his friend's body grasp his throat and struggle for air, Grim pulled his arm back as if getting ready to perform another punch and slightly lowered his posture.

*CRACKLE*

With flashes of yellow lightning dancing around his body once more, he dug his feet into the ground and applied reinforcement magic onto his arms and legs.

[Breath of Thunder: 1st Form Grim Style- Thunderclap and Flash]

*BOOM!!*

Moving faster than he had ever done so before, his body disappeared in a flash of lightning as both his figure and recently drawn back fist slammed into Lufulu's solar plexus with enough speed and force that the impact created a rippling sonic boom forming a giant crater beneath them as Lufulu's body was shot backwards and sent hurtling through several pieces of debris and destroyed buildings.

*BANG!!*

*BANG!!*

*BANG!!*

*BANG!!*

Even now, the sound of his body crashing through walls could still be heard even over here.

For Asta, Vanessa and Magna who were watching from a relatively safe location, the trio had trouble picking their mouths up off the floor as they slowly panned their head from the area Grim was standing at to the place where all the previously standing buildings were now coming down.

Shocked at the result of adding the [Grim Style] on top of [Thunderclap and Flash] brought, Grim took a moment to stop and look at his fist.

"Ha...Ha...HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!"

Breaking out into a fit of hysterical laughter, he couldn't help starting to jump up and down with excitement over the outrageous events happening around him.

Awakening his bloodline, bodying elves left and right, meeting someone whose strength far surpassed anything he'd ever seen before and finally developping a magic attribute that had long since become stagnant! For others this invasion might be seen as a disaster, but to Grim, this was a paradise!

Unable to control himself any further, he ran his hand through his hair and slicked it back before activating [Thunderclap and Flash] again to cross the distance between him and the distant Lufulu.

[A/n: He has white hair now, it'd go against my love of anime if I didn't make him slick it back like an edgelord.]

Having grown accustomed to moving this fast, a simple throat jab and shot to the solar plexus was nothing. If not for the fact that he was holding back, hitting vital areas like that would have killed both Luck and Lufulu then and there.

Arriving in front of Lufulu's unconscious body, Grim proceeded to pick him up and flash over to Asta and the others.

Knowing that Asta's anti magic seemed to be the solution to most magic related problems, he guessed that anti magic would also take care of this little reincarnation problem. Unlike the time he fought Fana in the Witches Forest, something told him that overlording his body with mana wouldn't get rid of the elf inhabbiting it. Probably because this reincarnation magic was much more stable compared to hers.

And would you look at that, with a simple touch of Asta's sword the reincarnation magic in Luck's body broke.

Watching the marks of reincarnation on his face disintergrate, the ghostly image of a blue eyed blonde haired elf that kinda looked like Luck reflected off of his eyes as it slowly ascended towards the sky.

"....The fuċk was that!!"