(A semi-indulgent story, but not brainless, with plenty of territory-building and faction-development. If that's not your thing, don't read it. The protagonist spends the whole story thinking he's walking on thin ice, when beneath it lie countless contingency plans left by his ancestors. Then, somehow, he ends up steamrolling everyone.)
When the legend of a dynasty that had endured for ten thousand years came to an end, the foreign races on every side looked upon this vast land with greedy eyes, no longer feeling the slightest awe.
Within the dynasty, the nine frontier defenses had fallen and news of the four regions' collapse still failed to rouse the high officials from their whirlpool of desire. The feudal lords saw the crisis as nothing more than a chance to gain new leverage at the political table, and continued to regard the foreign races' advance with arrogance.
Only when cold executioner's blades came down upon their necks did they finally wake up. Looking out in every direction, they saw a land laid waste, its people slaughtered, and humanity reduced to fodder for the myriad races.
Ji Xiao arrived in this chaotic age. In a world where everyone seemed to be competing to be the most rotten, he figured he only had to reveal a tiny fraction of the contingency plans his ancestors had left behind before he could proudly declare: “You lot are nothing but fools lining up to be beheaded!”