Enigmatic_Dream

WPC NOV Winner
***
“Hmph, my dumb big sister is in danger!”
A mischievous grin spread across his face. “Hehehehe... this gives me the perfect excuse to finally use this treasure I’ve acquired but never bothered with!”
He rummaged through his belongings, carefully selecting various items. “A bit of this... and this... and a dash of this.”
Boom!
The explosion of energy sent a ripple through the air as he laughed maniacally.
“Hahaha! It's done! Now, all I need is a compatible host for it.”

Years later...

“Did I overdo it?” he wondered in awe, watching as his creation wreaked havoc, conquering world after world with ease, as though stealing candies from children.

****
As you saw the synopsis, it will be :-
Op Mc
Harem
World Travels
And one side beating

Absolute Cheater

The noble girl's expression darkened. "They came back either mad or broken—some completely lost their minds, others couldn't even recognize their own families. The healers say it's not a curse, but something far worse. A nightmare they can't escape from."

She then added eyeing them " We want you to clear it" She said.

"And we already did it—killed the boss and even saw it dying," Asher said.

The noble lady shook her head. "It has been cleared that way many times. My father, Earl Leo, has done it himself… but it was never truly cleared. That's why we believe there is a hidden floor with the real boss."

She leaned forward. "I want you to defeat it and clear that dungeon for us. It will reform after 24 hours."

Asher immediately shook his head. "No."

Asher crossed his arms. "First of all, if you're asking for our help, don't act like you're ordering us."

Phantom Dungeon III