[Tensura] I became emperor of the eastern empire?!?!

What if Rudra, just after noticing that his ultimate skill was gaining consciousness and trying to take control of his body, realized that he couldn't win this fight at that moment? So he concluded that he must create a technique that would enable this while also deceiving Michael into thinking he had Rudra under his control. The technique he developed was the "Secret Art of Reincarnation." Officially, it was meant to prolong his life after Michael ensured he ceased being a hero and to give him time to defeat Michael. However, in reality, its purpose was to imbue his soul with willpower so that, after his ultimate death, he could retain his memories, return in his next reincarnation, reenter the cardinal world, defeat Michael, and reclaim what was his. But not everything went according to his plan.

(my first story)
(English is not my main language, sorry for any mistakes in advance)