From the Start, I Had a Supreme Immortal Aperture: The Stormy Apocalypse and the Skin-Clad Shark Maiden

[Decisive and ruthless + apocalypse + evolutionary sequences + human-skin scripture + villain]

Torrential rain poured down, floods engulfed the world, and the planet underwent a global transformation. In the later stages, everyone awakened supernatural powers and ran rampant.

In his previous life, he had no talent or powers. Attacked in the deep sea, he was saved by the merfolk princess. But after a treacherous schemer exposed the merfolk's location, he risked his life to repay his debt and perished in the raging floodwaters.

His deep-sea bloodline retraced its origins, and he was reborn amid the torrential rain with the princess's life-orb. Hidden inside it was a human-skin cultivation tome. He took revenge on his former enemies, refined the peerless beauty's mermaid-skin, and spontaneously opened a pocket paradise in his mind, naming it the Supreme Immortal Aperture. It ignored the barriers of the deep-sea realm, making him the undisputed ruler of the apocalypse.

While others hone their powers and fight for strength, I rely on my Immortal Aperture to devour all things. Slay an ability user, and their power becomes a spirit vein that I absorb into my Immortal Aperture, expanding my blessed land and letting me command the universe.

Wearing the skins of peerless beauties, I travel through the flooded wasteland with a thousand faces, feigning delicacy while concealing a blade, and taking my enemies' heads with a smile.

While everyone else relies on their powers to dominate, I alone cultivate immortality through my Immortal Aperture, devouring spirit veins, nurturing my blessed land, and building my immortal foundation as I climb to the summit step by step!