I've seen a lot of folks online get pretty confused about the conclusion of 'The Invincible Warlord'. The main thing to understand is that this is a web novel, and a long-running one at that, so the idea of a single, definitive 'ending' gets murky.
From what I gathered from various forums and a few MTL sites, the protagonist, that warlord who starts from nothing, eventually does unify the world or whatever realm the story is set in. He ascends to the absolute peak of power, achieving true 'invincibility'. The usual trappings—immortality, a harem of love interests, ruling over a vast empire—all seem to be in place by the final chapters.
But honestly, the plot is so repetitive after a certain point that the actual ending feels almost irrelevant. You could stop reading after the first thousand chapters and not miss much. The real conclusion is just the author finally deciding to stop writing the cycle of conquering a new territory, facing a stronger enemy, and then winning again. It wraps up, but it doesn't feel like a narrative payoff so much as the serial reaching its natural expiration date.