The Reincarnated Assassin is a Genius Swordsman - Chapter 702

Stranded in a world not his own, in a body not his own, Kaden finds himself stuck as a low rank marine in treacherous waters in the middle of an ocean where only the strongest can survive and a count down until a war that would shake the oceans and the very world itself erupts, where the kings of the sea will devour the chum. Gamer System. Insert.

Qin An was a former senior grim reaper who retired after serving the underworld for thousands of years. Because of his outstanding service and had enough merits, he was given a chance to become a human and unexpectedly transmigrated to the Interstellar era. But, how can he live his retirement days when has no money and everything? So, Qin An entered a reality talent show for idols and became an existence that everyone admires to.

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

The apocalypse has arrived, unleashing monsters across the globe.Jeremy, a high school student with a past life as a mercenary, awakens to an SSS-tier ability known as “The Eye of Omniscience.” This power allows him to perceive hidden cues invisible to others.[There's a silver treasure chest in the room to the left. Opening the chest with your foot guarantees a 100% chance to obtain a silver-grade item!][There's a hidden boss in the girls' bathroom. Defeating it with a sanitary pad will surely drop a rare skill scroll!][Slapping the job-change statue 99 times during your job change will unlock the hidden class “God Desecrator”!]While the rest of humanity is still living in fear, Jeremy has already obtained various god-level rewards thanks to his Eye of Omniscience.While others are still figuring out how to survive the apocalypse, Jeremy has already reached the pinnacle of humanity, confronting the gods themselves!