The Level Four Slime Wizard
The strange green Slime they'd picked up three years ago… could talk?
And not just talk—it was saying it would save the orthodox witches and lead its Slime species to freedom?
For a long moment, the young witches were frozen in stunned silence. Their wide-eyed expressions were downright adorable. They had secretly formed a small coven to resist the tyranny of the evil witches—driven by courage, yes, but utterly lacking experience. They were still so young, so innocent to the ways of the world.
This was the first time they had ever encountered a non-human, sentient lifeform.
Melly's mouth popped into a perfect O-shape. "Wait—are you… the formless god of wisdom from the old legends? The thrice-exalted Hermes?"
The witches gasped in unison.
According to the myths, Mercury—the god of wisdom and transformation—could take any shape, even that of a creature, to walk among mortals and guide them.
Elizabeth, their leader, was the most composed. Elegant and poised, she knelt immediately and said with reverence, "Great God of Wisdom Mercury, have you descended from the heavens to rescue your humble followers?"
Future Skywhale, still a Slime, tried not to laugh. He was actually about to go along with it. Why not? Playing god was a time-honored tradition among isekai protagonists.
But then Elizabeth's brow furrowed.
"No… it can't be," she murmured, shaking her head. "The great God of Wisdom wouldn't have been so easily humiliated by the evil witches… You pretended to be dead just to escape, and we had to carry you back. That doesn't sound like divine power to me."
The moment shattered.
Future Skywhale's imaginary deity status evaporated like dew under sunlight.
> Seriously? Why is it that every other isekai hero gets to pretend to be a god? But when it's my turn, I get captured, my Slime people get used as magic fuel, and even my lies are instantly debunked?!
Feeling defeated, he stiffly admitted, "I really can help you. I swear."
Elizabeth let out a gentle, pitying sigh and lifted him like a plush toy, stroking his gelatinous surface. "You poor thing. You've seen so little of the world. You have no idea how terrifying Medusa really is."
Her voice dropped, reverent and grim.
> "They call her the Absolute Empress Who Reigns Over Death. She's long surpassed even the legendary Three Witches. You think you can defeat her?"
"I do," he said without hesitation. "I will be the one to defeat the Great Empress Medusa!"
His voice was resolute. "You don't understand the potential of the Slime race. Under my leadership, we'll break free from the Rose Kingdom's oppression!"
There was a pause.
Then—
> "Pffft!"
The witches burst into laughter.
"He's such a cutie!"
"Look at his tentacle wiggle when he brags! So serious! So squishy!"
They surrounded him, teasing, hugging, and squishing his soft green form like a beloved plushie.
Melly hugged him tight to her chest and grinned. "Your kind is just too small and helpless. You bounce around like jelly, and can't even defeat a squirrel. You Slimes are only good for helping those evil witches train… And you really think you have potential?"
In the past three years, others had tried fusing with Slime blood. Eventually, someone even grew a tiny ahoge on their head—a comical, springy strand of hair. The strength it gave was impressive, but… that was all. They were still useless.
Slimes, by every metric, were the weakest of magical creatures.
"You just don't get it," Future Skywhale said seriously. "I have a very advanced biological structure. Especially this tentacle—this ahoge—it's the core of a Slime's power. The guarantee of our survival. It's the essence of our race."
Melly nodded solemnly, though her face was flushed from laughing.
> "Yes… your structure is powerful. Especially your feeler. It's… your essence."
Future Skywhale: "…"
> You've completely misunderstood. Again.
> I didn't design this biology to be a living toy. I was going for efficiency! Power!
He had a plan: obtain a sample of the Blood of the Evil Eye, assimilate its genes, and become a Slime capable of mastering the magical system of this world.
It wasn't just for strength. He had no choice—his species lived for little more than a decade. He'd already spent three years adapting to this world and learning the language. If he couldn't evolve and gain a second gene… he'd simply die of old age.
"You want to learn magic?" the witches gasped.
"A Slime wants to become a wizard?"
They exchanged stunned looks.
Then, Elizabeth's voice cut through the silence. "Melly, how much money do we have left?"
Melly's face fell. "Elder sister, please! That money was saved so you could break through to Level Three!"
Elizabeth gave a sad smile. "Even with the best resources, my potential is limited. At most, I might become a Level Three Witch. But this little guy… he's the heart of our coven. He belongs to all of us."
The girls looked down at the Slime nestled in Elizabeth's arms.
"…We still have 3,521 Rose Coins," Melly said reluctantly.
Elizabeth thought aloud. "A sample of Evil Eye Blood is 300. A Potion of Magic Compatibility costs 800. Blood Compatibility, 1,300. Blood Stabilization, 1,400... We'll need more funds."
"That's everything we have," Melly protested. "What if the Slime dies? That's all our savings!"
The room filled with anxious murmurs.
These potions were created during the Age of the Three Witches—refined across generations to help witches fuse with the Blood of the Evil Eye. Without them, the death rate was sky-high. Even women, who had a higher success rate, faced enormous risk. For men, it was ten times worse. And for Slimes?
No one knew. It had never been done before.
They could only guess the odds were abysmal.
Future Skywhale, overhearing their debate, felt his heart pound.
> This is my chance. This is my only shot. If they give me the resources—I'll make it.
"I know it's risky," he said, "but trust me. I'm the King of the Slimes. I'm destined to become the next Sovereign Mage Emperor!"
Elizabeth smiled and picked him up again. "Well then, O Mighty King of the Slimes… when you finally rule the magical world, what title should we call you?"
She giggled.
> "How about... The Adorable King?"
Future Skywhale fell silent.
They clearly didn't believe him.
But that was fine.
He would show them.
Over the past three years, even if they treated him like a pet, he had come to genuinely care for these girls. He owed them his life—and he would repay them.
Ten days later, after enduring unimaginable agony, Future Skywhale successfully assimilated the Blood of the Evil Eye. He gained a second gene.
He could now practice magic.
Just one month after that, he advanced from Novice to Level One Wizard.
> "Only a month?!"
> "He's amazing!"
The girls erupted with joy.
Their hideout was no longer just a secret tea-drinking club. They became a working coven, dedicating themselves fully to one goal: helping Future Skywhale grow.
The seven of them battled monsters, gathered resources, and scrimped every coin.
They spent nothing on themselves.
Everything went to him.
Future Skywhale, once a passive pet, now laughed with them, trained with them, and cherished them.
But he knew better than to act rashly. He wasn't like those hot-blooded protagonists who challenged the world before they could crawl.
> So what if I'm a leech? I'm a very happy leech.
> I've lived through hostile takeovers, corporate backstabbing, and billion-dollar negotiations. I've got no shame left to lose.
Leveling up, however, became exponentially harder the stronger you got.
After one year, he became Level Two.
Seven years later, Level Three.
And after twenty years...
He reached Level Four.
In the wizarding world, this was a major threshold. Only the most elite could reach it.
Most ruling witches of the Rose Sect were only Level Five—and though a Level Five Witch could still crush dozens of Level Fours, Future Skywhale wasn't just any wizard.
He was a Slime.
A Level Four Slime Wizard with maxed-out engineering skills.
A one-Slime army.
He could already challenge the strongest witches in the world.