Villain: The Buddha Was Once a Demon

[Overpowered protagonist + ruthless and decisive + crushing the chosen ones + villain protagonist]

Cheng Xiu transmigrates to a world of martial arts and gains the most powerful method of conversion: the Great Universal Salvation Buddha Light.

What does Buddhist conversion mean?

It means removing greed, anger, and ignorance from another person's heart, turning them into your most loyal believer and slave. That's conversion.

You're the chosen one, blessed with unbelievable luck and surrounded by countless beauties?

I've converted every woman in your harem. They're all my slaves now, kneeling to call me Master!

As for your fortune, the secret art of fate-stealing is made specifically to take the luck of the chosen ones.

You say the Heavenly Dao has your back?

I have a move that can slay the Heavenly Dao!...

Another version of the synopsis:

The Buddhist path gathers the faith of all beings, obtains the power of their wishes, and forges the fruit of true Buddhahood.

The demonic path gathers the filth of heaven and earth and the dark side of all beings, forging a true demon in the mortal world.

So what happens when one cultivates both Buddha and demon paths?

Cheng Xiu raises the Pure Land of Ultimate Bliss in one hand and stands with one foot in the Avici Hell.

“Those who believe in me may enter the Pure Land of Ultimate Bliss, escape the cycle of rebirth, and remain untouched by every calamity!”

“Those who refuse to believe in me will surely enter Avici Hell, where they will remain for all eternity, never to find deliverance!”