Sky Emperor: Restarting In Another World With Transmutation

{Overpowered+SliceOfLife+Accidental Kingdom Building+Harem+Elf+Fantasy+Scifi Elements} What would you do when find yourself transmigrated into the game you love?  For Gu Heng, the answer to this question is simple. Just like what he's doing now; retreating to the mountain where no one would annoy him and simply enjoy life. Though, he could do this because he brings two overpowered items with him, conversely, his desire is so bottomed out that Gu Heng boldly abandoned conqueror path despite having all the means to attain it. He simply couldn't bother. But perhaps, others see it differently?  "This is the Emperor's decree! Submit, or die!" "Do you really think you could fight the Empire?!" "Just surrender peacefully. The Empire would forget this grudge and even confer a title to you!" Things escalate too fast and suddenly the Empire wants him. But, you know, for Gu Heng, who knew the full capability of the Empire, it was akin to a dog barking. Such naughty dog should be properly beaten, you know?  So, Empire people, do you know anything about Aerial Bombardment?