Reborn As A Ghost: Time To Build My Undead Army!

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"We can take it!" Said Takeshi.

"Don't worry about us and trust us a bit." Laura added.

"Huhhh… Okay then." I sighed. I felt rather defeated, the two kids really didn't wanted to give up on it just because it was a strong monsters.

D+ Rank monsters are almost as strong as C Rank Monsters; those monsters would be strong enough to destroy a whole city if they are let loose. D+ Rank monsters are in the level of Wyverns, even, so it is very, very troublesome!

…Well, if something happens, I'll intervene and help them, I suppose.

After the small conversation where I ended giving them the permission to fight, Rock nodded as he smiled rather devilishly.

"Hehe, these kids are really something! To think they're willing to go against D+ Rank monsters at their age…" He laughed. "You wouldn't need to fight something so strong if you wanted to be regular students, but for those that want special privileges, they'll have to demonstrate they're deserving of them!"

Rock quickly called out a dwarf as he suddenly began opening the gates leading to another room in the small arena-like building. Laura decided to be the first one to fight, calling it "a big sister's responsibility", while the rest of us sat down surrounding the arena battlefield.

The monster quickly began to make its way into the battlefield, its size surpassing four meters of height, with a pair of enormous pincer claws, six legs, and its back covered by sharp ore-like growths. It was a gigantic crab.

"Here comes the first beast! A Giant Mithril Crab! This is a Peak D+ Rank Monster we caught some time ago thanks to a friend with the Tamer Class! Its Mithril is really expensive, but it is hard to slay it due to its incredible durability! Do you think you can defeat this monster?"

CLANK! CLANK!

The large crab clicked its enormous metallic pincer claws, the moment it spotted Laura, it began running towards her at a surprising speed! It looked like a tank going at the speed of a motorcycle, if Laura receives the impact directly, she'll get crushed!

"LAURA!!!" I cried, trying to make her move away from her position to evade.

However, she remained calm as she looked at the monster approach, suddenly grabbing a Black Stone from her pocket.

"Detonation."

FLASH!

She suddenly threw the stone directly towards the crab. The stone was so small and inoffensive that the crab paid no mind at evading it or intercepting it with its claws, the stone easily hit its head.

And in mere seconds, the stone suddenly shone bright red.

BOOOOOMMMM!!!

"EH?!"

Rock fell out of his own seat as he saw what just happened.

"CRAAHH…"

The crab gave out a groan of agony as the smoke covering the battlefield slowly dissipated, there were several cracks over its carapace, and one of its pincers just fell off its body easily, the monster was bleeding some blue liquid from its interior, and its mouth was bubbling stressfully.

"A-Amazing… That's Laura's Unique Skill, right?" Wondered Partner.

"Yeah…" Emeraldine said. "But I remember that it wasn't this powerful before…"

"It is because of her growth." Lucifer pointed out. "Her Unique Skill [Detonation] increases in power the more her Magic Stat increases, the more she leveled up back then and trained her magic, the stronger her Detonation became… even a black stone can be this deadly."

"So anything that is not alive that she touches ends up becoming a deadly bomb now…!" I said in excitement.

"CRAH… CRAAH!"

The crab furiously raged, quickly getting up once more as the earth below it trembled, it conjured Earth Magic! Was this spell [Seismic Wave]?!

TRUUUUMMM…!

The floor quickly began to crumble, as Laura's body was suddenly enchanted by a black aura generated from within her Demonite Heart Core! Has she learned how to control this power already?!

CLASH!

CLASH!

CLASH!

The crab's claws hit the ground constantly, trying to chase her down, but Laura easily avoided the attacks nimbly, as her Black Aura seemed to enhance her speed and swiftness.

In a second, she grabbed another stone from her pocket- no, several of them, and lunged them at the crab together!

The crab, knowing that these stones were deadly, attempted to intercept them with its other claw.

BOOM! BOOM! BOOOOM!

"CRAAAHHHH…!"

The crab gave out another pitiful groan of agony as its entire pincer claw blew up into pieces by shielding him from most of the explosions. However, it somehow managed to survive.

"CRRRRAAH!"

A second after, the first claw that was destroyed suddenly regrew anew! Wait, these beasts got amazing regeneration! It only had to wait like a minute… Will the other claw also regenerate easily?

"Huh, you're quite tough…"

However, Laura moved at an incredible speed, imitating my [Shadow Travel] using her own Black Aura, and suddenly emerging behind the enormous Mithril Crab. Rock was once more shocked by the girl's amazing abilities.

"W-What sort of magic is she using?!" He wondered.

However, everyone was too concentrated in the fight to pay any attention to the old man, as Laura quickly made her claws grow by infusing more Black Energy into them. This energy came directly out of a Crystal Core in her heart made out of the secretions of a Fragment of the Evil God, this energy was something we called Miasma or even Demonic Energy.

FLASH!

Her claws grew three times their original size, resembling monstrous claws made of darkness, as she quickly began using them to crush through the crab's back, destroying the mithril and other ores growing on its back and then…!

"Detonation."

She threw an ore she grabbed on the way inside the wound and jumped away just before the explosion!

BOOOOOMMM!!!

The entire body of the crab exploded into pieces, crumbling apart into the entire floor…

Everyone was left flabbergasted, me included.

"W-Wait a second, Laura, you're way too strong!" I cried in surprise.

"It's nothing much…" Laura said gently. "I am just tired of being a helpless child, so I trained every day since you rescued us, Auntie!"

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