Goblin, from Swords to Guns

[Western fantasy, goblins, hegemony, mount and blade system, climbing the technology tree, total war]

Li Qinwu traveled through time and space and became a goblin. He obtained the mount and blade system, recruited soldiers, upgraded the fortress, climbed the technology tree, fought World War I, World War II, filled in the map, ruled the world, enslaved all races, and made the world full of graininess.