Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 724

The world had shown Baines every possible lesson it could teach; from familial love, joy, and peace to hate, rage, betrayal, and pain.He got detached from his family by the wimps of others.But, before he began his journey to find them, he was forced to witness that scene that haunted him once more. The destruction of his home.He was about to give up on life when an unforeseen opportunity presented itself.There, he vowed, “The world will bleed for what it has done to me.”Using the greatest collections gathered by his ancestors, he set out on the thorny path to revenge.Little did he know, the result of his actions followed other cascading events that then threatened his world.Does he refuse to help the world because of the pain it had caused him? Or, will he join in the destruction?

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

He didn’t want any part of it.He wanted to be independent.He didn’t want to become a side character in the story of some so-called protagonist.Yet, Mo Zhiran couldn’t run.Heaven wouldn’t let him, for he was an extra destined to die for the rise of the protagonist.An expendable nobody, unnoticed and forgotten.In the end, Mo Zhiran was betrayed by his own clan brother just to save a girl who appeared out of nowhere. Worse, before his inevitable death, he even had to block the danger for that same brother, unwillingly.He was basically a Redshirt.“Haha… Heaven is so unfair.”Zhiran hated them both to the core. If he got another chance, he swore he would make them pay a hundredfold for every drop of blood he spilled.And fortunately, he did.Reborn with an unusual system in hand, Mo Zhiran would no longer be a disposable extra.This time, he would carve his own path, one step at a time.Even if it meant being forced to be a Villain.

The most dependable (sarcastic) assassin -- Gao Xuan.Developing himself with an inventory of powerful gear. A master of biding his time, backstabbing, and brutalizing weaklings.Don’t love me. Nothing would come out of this.I am an assassin without feelings.