Harry Potter: The Seven Deadly Sins of Slytherin [LITRPG/ OP]

Hermione Granger's neighbor got a Hogwarts letter.

She was thrilled. And he... went back to sleep.

Elias Sorenson arrived at Hogwarts with three things — a childhood friend who studied too much, a System nobody could explain, and a sleeping schedule that made professors question their career choices.

He skipped lectures. He napped during Quidditch. He once submitted a Transfiguration essay two weeks late and still got the highest score in a century.

The students called him gifted.

The professors called him a problem.

The ancient Basilisk sleeping beneath the school opened one eye, recognized him, and called him something else entirely.

Master.

See — Elias doesn't track mana. He doesn't track talent.
 
His System tracks Sin.

And after seven hundred years of waiting to come back?

He has a lot of it.

Voldemort wants to conquer the wizarding world.

Elias wants an uninterrupted nap.

Only one of them is going to be disappointed.

And it's not the one who built this timeline from scratch.