Memory of Heaven:Romance Written By Fate Through Beyond Infinity Time - Chapter 599.1 Special : Spiral—A Language Older Than Meaning

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.

This is a world where humans, demons and mysterious beasts coexist.

Humans cultivate mysterious qi. Demons cultivate corporeal bodies. Mysterious beasts cultivate soul perception.

A legend says that in the middle of an endless rainforest, there are extremely powerful existences; they are called demon kings.

Some demon kings have a tyrannical corporeal body, some are experts in illusions.
Some demon kings are proficient in magic, some can even move mountains.
Some demon kings are able to sense things thousands of miles away.

These demon kings rarely appear in the human world. Even if they emerge in the human world, they would reincarnate in human form; assimilating with mankind while seeking to breakthrough realms…

- Description from Novelupdates

In a fantasy world where everything depends on level, only ostracization and pain awaits a man that is unable to level, even if he was of noble birth.

But what happens he discovers an alternative source of experience…

Steven awakens to a nightmare. Transported to a brutal medieval kingdom on a faraway world, he wakes up as Kivamus, the exiled third son of a Duke. Now he’s the newly made Baron of a crumbling village called Tiranat, in a bandit-ridden frontier located within untamed forests. Here, survival is a daily battle, resources are scarce, and technology is a distant dream. Yet, he sees potential where the villagers only see struggle. He dreams of using his knowledge to forge a new future for Tiranat, a future fueled by industry. But the path to progress is not going to be easy. Managing a starving village in the coming winter and navigating the cut-throat world of medieval nobility is just the beginning. This is a slow-progression kingdom-builder story, with a lot of focus on worldbuilding and eventually, industrialization and tech-uplifting. The story is going to be very, very long. Settle in for a slow-burn slice of life, where the journey is just as important as the destination. Welcome aboard!