I Secretly Develop Myself In The Demon World - Chapter 273 - 170: New Branch Line_2

Pinnacle of martial, mountain shifting and sea filling, catching stars and seizing the moon, reverse the flow of time!

Extremity of the sword, one sword to form the dao, one sword to reach the immortals, one sword to break the laws!

The young Li Fuchen, chanced upon the Golden Talisman which allowed his spirit soul to constantly evolve. In this world where prodigies and experts were everywhere, he used the sword in his hand to ascend to the absolute pinnacle.

The world will decay one day, but my reverence shall be eternal.

- Description from Novelupdates

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

She, a renowned assassin of the 21st century, actually crossed over to become Su Manor’s most useless good-for-nothing Fourth Miss.