MTL - Starting My Cultivation With Immortality - ~ 1 day off

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 died in his first life, as an ordinary human inside an ordinary planet.

In his second life, he swore to live a life of supreme power, and so he did. He reached the apex and exterminated his enemies to oblivion.

Dying, he was reincarnated in a world which could use Chakra. He became The Overlord Of Every Being, Ruler Of 6 Universe.

Unfortunately, he died. Using a mysterious method, he was reincarnated once again inside the world of Tales of Demons and Gods.

This was an era where everyone could experience various worlds through simulations.

When everyone reached 16 years old, they would receive a Life Lantern, which would grant them two free simulations.

During the free simulations, they had to break through the limits of humans in order to attain a bright future in reality.

Otherwise, they would lose their Life Lanterns and they would slowly be corrupted by a black fog until they eventually died at a young age.

Lin Qiye, who transmigrated to this era, failed his first simulation.

During his second simulation, by chance, he acquired a permanent SSS-rank talent – the Deduction of Genesis.

Lin Qiye’s first life: [When you were two, you had a sudden illness, causing you to have a deformed head and low IQ. When you were 15, your parents passed away. When you were 18, you died of an incurable disease.]

Lin Qiye commanded, “The Deduction of Genesis, deduce for me a way to transcend this life.”

[Congratulations for defying the heavens and successfully changing your fate. You acquired S rank in your evaluation. Your rewards are…]

…

His second life: [When you were 15, the spiritual aura on Earth rejuvenated. You did not awaken any talent while your childhood best friend achieved outstanding attainments with her awakened talent. When you were 16, you were killed by a stranger.]

Lin Qiye summoned, “The Deduction of Genesis!”

[You carefully made plans before the spiritual aura rejuvenated. Because of this, you defied the heavens and successfully changed your fate. You acquired S rank in your evaluation. Your rewards are…]

Yin BiYue has made the worst purchase ever. After transmigrating countless times into the bodies of canon fodder villains, he buys a ‘Fiend Halo’ from the Rebirth Company, supposedly the best aid for an up and coming final BOSS!

He’s ecstatic to finally get a villainous role where he won’t die after just a few lines, if any at all, and is raring to become the best opponent a protagonist will have… However, why was everyone looking at him with pitying eyes? Why was the protagonist rushing over to help him get out of his crimes? Most importantly, why was his ‘Fiend Halo’ just making things worse?!

Meanwhile, the intern salesperson at the Rebirth Company discovers that he might have accidentally sold a prototype White Lotus Halo to a certain villain…

- Description from Novelupdates