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Frank used his Undead Progenitor Transformation Skill, changing his entire structure and turning it into an Undead. His heart stopped beating, his eyes turned crimson red, gleaming with eeriness, his skin was now pale white, and even his hair had begun to turn silvery white. ​​

As Frank experienced the constant changes from living to undead, his appearance as an Undead Progenitor began to change and become more noticeable, even his hair had begun to turn white when he turned into an Undead Progenitor, and he felt like a small horn was growing as well whenever he changed, although it was still small.

It seemed as if his appearance constantly became more and more connected to death as he changed back and forth… However, his human form always stayed the same…

As Frank rushed towards the Giant Demon Rat, he began to consider what he really had become, and what was he now… Was he a human capable of transforming into an Undead? Or was he an Undead capable of faking his own self as a living human?

The voice of Hades echoed through his soul.

"It seems that your appearance as the Undead Progenitor is slowly changing. Fear not, that is natural, you're adapting better to your powers," said Hades, as Frank ignored his words and raised his fingers, without even wielding his dagger, he extended his nails, becoming black, armor-like claws.

The claws broke through the Rat's hard fur and skin, slashing a large piece of flesh out of it, which came with the delicious scent of fresh blood and meat, making Frank's senses become sharper, as his mouth began to produce saliva.

Although he was an Undead Progenitor and he didn't suffer the negative effects of being an Undead, that didn't mean that he wouldn't feel the basic instincts of one, which were not considered as negative.

Negative effects included things such as weakness to Holy, Light, and Fire Magic, needing to eat the fresh flesh of the living to sustain itself, aversion to sunlight, amongst many other things, but this didn't include that he would not feel hungry by seeing fresh flesh and blood being splattered over himself.

He had been mostly fighting on his human form, so such feelings were mostly suppressed by his skills and strong will, but now that he was giving in to the Undead powers, he couldn't help but resist the urge of jumping into the Giant Demon Rat and devour it alive.

"Grryaaarrr…!"

The Giant Demon Rat shrieked in agonizing pain, as Ruby and Zhulong released a breath of fire and thunder against it, frying its tail that was covered in sharp black scales, while Nezhit came forth, using its enormous arms and hitting the rat's torso several times with immense speed and strength.

Clash! Clash! Clash!

"G-Gryaar…!"

The rat struggled, biting and slashing Nezhit back, however, Frank came forward, baring his claws and slicing again, while releasing fireballs made out of blue flames that began to slowly freeze the Rat's skin.

"Grryaar!"

The Rat roared, releasing a barrage of dark bullets in response, Frank considered that if he had fought with such a resilient monster with Hilvera, Asterion, and Annabelle present, it would have been extremely hard to protect them.

However, his monsters were naturally experienced in fighting somehow, even those recently hatched like Zhulong were good at it, and Nezhit who possess experiences of four former bandits was also quite good at fighting, better than the clumsy younglings, although Frank still saw that they were promising and held great talent on their own.

The barrage of dark bullets showered the group, as Frank began to use Ginseng to drain the Mana out of the Giant Demon Rat, which happened rather fast, as the rodent had its mana emptied, it cried in surprise as its barrage of low-level spells stopped suddenly.

"Roar!"

Zhulong angrily bit into the Rat's ear, tearing it apart and flying away, the rat shrieked, following Zhulong and trying to bite his long tail with its sharp tooth.

"Grawr!"

However, Ruby intercepted it and used her own tail as a limb, hitting the rat's face with it and then releasing a larger than usual fireball into its face, making the resilient giant rodent back down a few steps.

"Hmph!"

Nezhit put his strength into action, using his legs and kicking the rat's stomach with a strong leg uppercut, only for Frank to intercept the rat at last in midair!

"If I combine Gray Magic with Dark Death Devil Magic… then should I be possible to… Yes, I can!" thought Frank, as within mere seconds, he mixed his spells from Gray Magic and Dark Death Devil Magic, generating five spears of darkness and death around himself.

"Death Spears!"

Flash! Flash! Flash!

"Grrryaarrrr…!"

The Spears of darkness and death impaled the rat in midair from all sides, making enormous rivers of blood splatter all over the ground, the rat fell into the ground, motionless as it had died instantly by Frank's powerful spell combination.

"Amazing, kid!" said Hades, congratulating Frank, as Frank fell into his knees, his entire senses were twisting and his body and muscles were aching, he felt as if there was a hunger that could not be easily appeased.

He then glanced at the fresh corpse as his crimson eyes gleamed eerily, jumping into the freshly killed rat, he began to devour it with his bare claws and jaw, tearing apart the fresh and tender flesh, and drinking the plentiful of refreshing blood as if it were the sweetest of elixirs.

His body suddenly stopped aching, as it calmed down after a few minutes of madly eating the raw flesh of the monster.

Frank slowly changed back into a human, as he felt the disgusting taste of raw flesh and blood in his mouth while being all over his clothes.

Frank instinctively moved away, vomiting everything he ate as he felt strong nausea.

"My lord!" said Nezhit, running towards Frank, and petting his shoulders.

"Brat, what's wrong with you?" asked Hades.

"You stupid transformation… I can't get used to eating raw flesh… Ugh…" muttered Frank, although he liked the classic sushi in Tokyo, eating finely cut and mildly boiled fish without any disgusting blood and with many other delicious ingredients to go with was completely different than the warm flesh and blood of a giant and disgusting sewer rat.

However, as Frank slowly calmed himself, he felt renewed, he used his Water Palm Technique to create water, which he used to wash, while also using the Death Magic Spell Sterilization to clean off his clothes better.

After a few minutes, he drank an entire liter of water to clean his stomach, and then a tonkatsu sandwich which he had bought back on Earth.

"Phew, way better than some disgusting raw flesh…" said Frank.

Although the Tonkatsu sandwich was rather delicious, Frank felt that there was 'something' that it lacked, but he lied to himself thinking nothing of it.

However, Hades who looked at him with a bit of concern knew that Frank would sooner or later have to adapt to this.

Although he had given a lot of power to the boy, there were a few weaknesses that he should have to go through… After all, power always comes with a price.

"You say that it is disgusting but you ate it pretty happily there… And look at Nezhit, he's devouring that rat's leg," said Hades, pointing at Nezhit who appeased his hunger for raw and fresh flesh by eating a piece of the Giant Demon Rat with Frank's permission.

Ruby and Zhulong were also eating a piece of tender meat, as Frank had saved the rest of the carcass inside his Inventory, which also came with a larger than usual Mana Core inside.

Frank ignored Hades as he drank a bit more freshwater, stretching once again.

"Alright, let's go," said Frank, expanding his shadow and letting his friends hop in, he once again rushed through the dungeon, diving deeper as he found many monsters on his way.

Although they were not as strong as the 'Mini Boss' of the Giant Demon Rat, each monster was at least Rank 1 Middle Stage, packing more strength than they would usually.

In between the slaughter, Frank came across a large Plant-type monster, a very rare and precious one named Dark Mandragora. From what Frank had read in the Adventurers Guild, Dark Mandragoras were even rarer than normal Mandragoras, so he instantly leaped towards it, expanding his spider threads enhanced with his various spells and skills, and quickly catching the mysterious monster.

However, the moment he caught it, the creature began to scream so loud that it made everyone present instinctively cover their ears.

The Dark Mandragora had exceptionally low physical abilities and seemed to not possess Magic Spells, but its scream was so strong that Frank felt as if he was being showered in a powerful pressure and pain that even reached his soul!

He quickly put his will into it, covering the damned monster's mouth with a ton of thread, until it could only shriek a scream of low volume.

"The power of the scream of a Dark Mandragora is terrifying… Wait, what if I tame it?" thought Frank, considering in taming the creature as its scream was pretty strong, and could come in handy… Although he would have to bear with it if he wanted to weaponize it first.

"I don't think it would be a good idea unless you want your eardrums busted," said Hades.

"It is a vexing creature, my lord…" said Nezhit.

"Grawr…"

"Roar…"

Ruby and Zhulong agreed with Nezhit and Hades, as even Ginseng within his hand didn't want such a companion.

"Well, let's kill it, for now, perhaps I can use its roots to create a new one, as I've read that Mandragoras can be 'breed' by cutting off the roots while the creature is still alive and putting them inside dirt…"

Frank quickly cut off the creature's roots, saving them in his inventory and then killing the Mandragora with a Dark Death Devil Spell named 'Devil's Whisper' which did direct damage to the soul of the monster, making the soul literally run out of the body, dying instantly.

Such a strong spell was already tested before, and it could only reach this result if the creature were incredibly weak-willed and also trapped and hopeless. Otherwise, most of what could be achieved was a little scare.

Although Frank had been developing more the Dark and Death areas of his Dark Death Devil Magic Skill, he was trying to form new spells with the Devil attribute, which had the power to affect the soul in different ways, although they seemed even more complicated than crafting spells using Dark and Death Attributes.

Frank saved up the Mandragora's corpse and continued through the dungeon, finally reaching the center of it, where he felt the presence of something enormous within.

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