I Am The Destiny Villain - Chapter 1 - . Damien VoidAngel

Martial Soul, the essence of innate talent, encompasses the grade of countless stars, with one to three stars being Low Level, seven to Nine-star being Advanced, and a Ten-star Martial Soul as a Heavenly Gifted Spirit, known as Spirit Martial Soul, one in ten thousand!The world asks Luo Cheng: “How many stars is your Martial Soul? What grade?”Luo Cheng stares at the endless galaxy within his Martial Soul and mutters:“That's a lot of billions, it's hard to count!”

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

After dying from betrayal, Thomas reincarnates as Jolthar Kaelzhar, the neglected son of a powerful clan, just after his brothers kill him. With Jolthar's memories and the blessing of Qalena, Thomas vows to rise from his lowly position and claim power in his new life.

He was an addict, a loser, a despicable human being.