Junior sister, keep forbear for a while, I almost become invincible as soon! - Chapter 3 Senior Brother Helps You with Body Refining

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

After being reincarnated as the youngest son of Emperor Wu of Zhou, Zhao Yao was not favored much. In order to survive the bloody power struggle for the throne, he had to bide his time. Finally, he grew up and was granted a title of nobility, only to be exiled to the distant region of Lingnan by his dear father.It was said that Lingnan was incredibly poor, but Zhao Yao was not afraid. He focused on infrastructure and production. Under Zhao Yao's management, Lingnan transformed from a place of exile into a prosperous land.Just when Zhao Yao was happily living his carefree life in Lingnan, the ministers traveled a thousand miles to beg him to ascend the throne.Zhao Yao was baffled. Had these ministers lost their minds?

Living things really are ignorant – the greed to obtain the key to knowledge and the fundamentals of energy overpowers them. Little do they know that knowledge is full of lies and energy is the root of destruction. Us, mages, have mastered travelling through space and time. We are invincible, we can turn worlds into dust and you, mere ants, will be wiped out with no trace.

-Mage Adam

An A.I.(Artificial Intelligence) gets reincarnated into a world where he becomes a mage.