Reincarnated as the Demon King's Son - Chapter 815 - A Challenge

Death is sometimes not the end!
Dead prison!
This is a magical prison. It has the ability to draw the souls of the dead people of the world, and it also enables people to gain the ability of the souls of the dead.
When Qin Song woke up, he was shocked to find that he had come to the world of One Piece, and even more surprised that he found a prison in his body…..

- Description from Uukanshu

The formless ancient world was infested with despicable demons. They hunted and feasted on mankind, keeping the human civilization constantly in a weak and suppressed state.

Once upon a time, a boy was referred to as a “War Hero.”

In another world called Aletia, the boy who had saved the Lost Kingdom, conquered their neighbouring countries, and led to the rise of a grand empire decided to throw everything away, returning to the modern era at the cost of his memories.

As three years passed, the boy who was happily enjoying his daily life was once again called back to the other world.

However, what awaited him was the Aletia of 1000 years in the future.

As his past glories became a “myth,” the legend of the youth referred to as the, “Twin Black Hero King,” begins.

He Xingzhou knew about the invasion of the worm clan and the dangerous fate of the solar system. To resist the apocalyptic crisis, he stepped out to warn mankind!He Xingzhou shocked the world when he built a nuclear reactor and activated the genes of the worm clan on stream!Thus, under his plan, the entire country started building steel cities, massive mechs, spaceships, space castles...He Xingzhou said, “Let's set a small goal. Let's first build a Dyson sphere around the sun.”[Dark Technology] + [Engineering Upgrade] + [Solar System Exploration] + [Dyson Sphere Plan] + [Star Cluster]. All of these elements make up our latest sci-fi novel!