Sky Emperor: Restarting In Another World With Transmutation

{Overpowered+SliceOfLife+Accidental Kingdom Building+Harem+Elf+Fantasy+Scifi Elements} Just when Gu Heng was ready to open a new page in his life, after his long-favored game, his personal oasis to go through the hardship of life, announced to stop their service, fate holds a different ways for him, one that he cannot expect. After finishing the last mission in the soon-to-be closed game, he was given two things; a Mythical gear called Tesseract, and its complimented skill, Transmutation. But, just when he thought those was the only one and about to bid a goodbye forever, a ticket with question marks as its title and description found its way to his in-game inbox. Curious, he clicked 'use' on the ticket, and transmigrated into an orphan boy in the middle of the Empire. It was not long that he found out the world is the same as his favorite dead game. And his Transmutation, paired with the Mythical gear Tesseract, proven to be powerful enough to topple the Empire alone. But Gu Heng doesn't want that. He wished to realize his fantastical dream of having a sky land, and sci-fi environments. Thus, he choose to retreat into the mountain and secretly build his dream there. But of course the world can't leave him alone. A tribe of elf suddenly camped in his mountain, a pet he raised that suddenly leave, suddenly coming back with the whole packs of monsters, and at some point, his mountain has been recognized as a nation and his abode, a flying piece of land, became his trademark. He himself was unknowingly crowned with the title of 'Sky Emperor'. By the time he realized this, he could only stand in front of masses bowing to him with a stupefied expression, trying to find when the hell is thing starts to go wrong.