Necropolis Immortal - Chapter 2203.1: Hadal Fire

He reincarnated into a hunter world and became an underwater hunter.There were only 20 people in the entire country in this minor profession, but it didn’t matter. He liked the sea.“Crazy! There’s a real artifact?!”“Ahahaha!! How much is all this worth!!”But then, the Great Diving Era began.“Ah, it’s so beautiful… I want to see more, more…”“W-What is that!! Save me!!!”“Aaaargh!!! My head!! It feels like my head is going to explode!!”…It would be better not to go in there.

In a bustling modern city where ancient secrets and mysterious powers collide with everyday life, 22-year-old Ethan Cross seems like your average college student. Behind his unassuming demeanor lies a man shrouded in secrets—a masked vigilante known only as “Virtuoso,” feared by criminals and sought after by powerful organizations.Ethan is overpowered, sarcastic, and ridiculously skilled at everything he does. But there's one thing he’s terrible at: romance. When the enigmatic and fiercely independent Mia Harper stumbles into his life, she unknowingly becomes the key to unraveling a conspiracy that ties Ethan's past to an ancient prophecy.Between laugh-out-loud moments, explosive action, and unexpected twists, Ethan navigates his double life while trying to protect Mia, keep his identity hidden, and maybe—just maybe—figure out how to confess his feelings without being a complete disaster.

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

Among the demons, the supreme ones are called “Great Saints.”

A young man leaves his mountain village and travels around the world. By unceasing efforts, he finally becomes a legend of the age.

- Description from Novelupdates