Return of The Imperial Swordsmaster

Nilhilus von Veristan, the one who led the Empire of Veristan during its greatest period. In just a single generation, the Empire pushed back the Wailing Wall back 1200km, planted the imperial flag on the tallest palace in capital of demonkind, and united humanity under one banner. This is the story of the return of the Swordsmaster Emperor, Nilhilus von Veristan after thousands of years. May the divine light of Veristan shine once more. (You guys can decide whether you want this story to have a harem or a single female lead. I may or may not listen to the vote, depends how I want this story to flow. Trust me, romance wont affect the story or the mc's character in any meaningful way, trust me)