This is the story of a hapless kid who transmigrates to the Eternal Arena and gets roped into working for them.
"Go trick heroes into coming here to fight, and I'll reward you," the Eternal Arena tells him.
"Sure... I'm on it." A little while later... "All done. I'm back."
"I've given you your reward. Now you're a hero, just like them," says the satisfied Eternal Arena.
"What the heck is this class? Master Con Artist?" The hapless kid is dumbfounded.
"As a professional con artist, naturally you should make a career out of conning people. Go on, trick lots of heroes into coming to the Eternal Arena. The more you trick, the greater your rewards! One day, you'll surpass me!" The Eternal Arena makes an empty promise.
"Can I freaking refuse?"
"No."
"..."
This novel and its characters are entirely fictional. Any similarities are purely coincidental. Do not imitate.