Extreme Flame Wizard - Chapter 146: The Knights and the Wizard

Ziel Grisel (Nijisaki ken) succeed defeated the fallen god-king in divine war. But he was cursed by the god and lost all his emotions. Until finally he created the reincarnation magic of his skill to remove the curse.

900 years later it has passed and ken successfully reincarnated. Unfortunately, The curse cannot be eliminated. And ken must be forced to live his life without his emotions. Ken finally Determined to live a quiet and peaceful life in those days as a….Butler?

They say the greatest blessing is marrying the idol you always dreamed of.

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