Reincarnated With The Undefeated System - Chapter 211 First Main Quest Accomplished.(5) (R18)

One day, a tower appeared in the skies of all the major cities…

However, he did not know that he was not raising just a harmless pet, but a biological weapon secretly made by the government… a real monster.

As a former librarian, Rand felt that he had been living an ordinary life, the one that he had reclaimed unconsciously every single day.

Recently, he has been a little upset because the pet fish he accidently brought home to raised seems to have undergo some strange changes

Well, it turned into a merman.

- Description from Novelupdates

The discovery of the so-called dimensional world heralded a new era for humanity.

This world, populated with lifeforms of ever-increasing strength, would soon become known as a treasure trove for those hunters willing to brave its risk.

Soulshards and gene fragments obtained by killing such lifeforms could be assimilated into their bodies, transforming them into genetically enhanced fighters and setting the stage for the age of genetic enhancement.Zhang Lie, a seasoned fighter who had once explored the fourth of the five known realms of the dimensional world, finds himself thrown back into his youth, to the initial heyday of exploration and growth, before the secrets of this new world had been mined and revealed to all.

Armed with foreknowledge, Zhang Lie will blaze a path for humanity to the stars—and beyond.

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A man is reborn into the world of Avatar: The Last Air Bender as a waterbender from Katara's tribe. Best of all, he was the same age as her, and he had a system with him to help.He knows the future and a system that lets him continuously get stronger by completing quests or long-term missions, as well as giving him the ability to copy abilities from others for himself. He will become invincible in the world of Avatar, even more so than the Avatar himself.