Isekai Maou to Shoukan Shoujo Dorei Majutsu - Volume 6 afterword

Yang Feng somehow transmigrated into a different world and received a legacy of an ‘ancient high tech’ family, which does not directly raise his power, but gives him the technology to build things which are way more advanced than the seemingly medieval world.

But to build something you need resources and energy. To receive resources you need strength. To gain strength you need knowledge. To gain knowledge you… need strength? or a background? Or maybe a fully armed army of high tech robots who aren’t afraid of death?

But is this legacy really for him to keep?

- Description from Novelupdates

Wu Lai was an ordinary high school student. One day he was struck by a flash of lightning from a different world, and suddenly entered a fantastic world full of magic and swords. Since then, he started a totally new life. In this supernatural world, he had his ups and downs, experienced numerous battles, subdued powerful evil beasts, and fell in love with a belle. His nickname “Demon King” was remembered throughout the ages there.

Stay or return was a question. In the face of this choice, Wu Lai, with the nostalgia and gratefulness for the original world, finally chose to stay…

Here was the legend of “Demon King”…

- Description from Novelupdates

Fate, a gatekeeper who had been working for the castle, is beset by a few burdens.

In the God Domain, Cultivators were far and few between, but each of them wielded power that would make them known as gods.

How did they come to have such power? They comprehended the laws between heaven and earth and became those very laws.

But something occurred, a youth that hadn’t gained the acknowledgment of the heavens to become a cultivator chance upon Qi. Determined to reverse the bad hand faith had dealt him he started researching it and came to a shocking conclusion. The very laws that the heavens prevented him from comprehending were swirling around in this strange energy!

The youth thought to himself that if he could somehow control it, then he could defy the heavens and become a cultivator. Without any hesitation he began researching more and found out that the only way to control this newfound energy was to absorb it within his body.

After many years of preparations, he did exactly that.

However, he promptly died from the finger size strand he absorbed.

Ten years after his death a cultivator found his research journal and decided to further study this fascinating idea.

Skip forward to an unknown period in the future and a baby was born into a powerful royal family as the second prince. Upon his birth this child had the laws of heaven and earth swirling around him. This immediately sent the royal court into a stir as they thought the heavens themselves had blessed the Emperor’s second son.

But as that was happening, the baby that had just been born saw the midwife use a spell to turn Qi into water to clean him.

Upon seeing this, the baby’s eyes widen into saucers as a voice screamed hysterically in his head, “W-WHO THE FUCK STOLE MY IDEA?!”