Tsuguko Demon Slayer

I woke up to find myself a weakling vampire with only 10 health points, and the Holy Light Knight Order was right outside to purify me! In my despair, the 【Proficiency System】activated—so long as I live, everything is grindable! To survive, I did anything! While other vampires were hunting maidens, I was slaughtering a hundred thousand rats in the sewer, my 【Bite】skill maxed out, awakening the talent 【Life Drain】! Holy Light burns painfully? I treated myself like the Monkey King's flesh and braved the Holy Light, my 【Holy Light Resistance】maxed out, awakening the talent 【Holy Light Affinity MAX】, and directly took a Holy Light bath in the church! They thought I was an elegant noble, but what I was actually thinking was, "This sword strike will probably only take 0.001% of my health—too risky, I must kill him instantly!" They called me the "Nighttime Scourge" because I targeted only the most heinous scoundrels, after all, the proficiency points from "Sinful Blood" were simply too generous! Years later, the Abyssal Demon God descended, and the gods fell. In the despair of the entire world, I brushed off the dust from my tailcoat and looked at my blood bar that had grown to an uncountable length. "You... can break my defense?"

They burned his name. Betrayed his trust. Left him for dead. But death…didn’t take him. Aiden Vermillion, once mocked as the weakest man in the kingdom, rises from the ashes of betrayal wielding a power ancient enough to terrify the gods. Branded a nobody. Forgotten by history. Hunted by darkness. He returns cloaked in a new name, a new face...And a vengeance that could crack the heavens. With a system bound to his bloodline, an empire to reclaim, and a prophecy written in demon blood, Aiden is no longer just fighting for justice. He’s coming to tear kingdoms apart. To expose traitors. To shatter thrones. Three wives. One sword. Infinite rage. The Lord of Destruction wants the world to burn. But Aiden? He plans to burn Vatou first.

The kingdom of Arvendral has fallen in a single night of fire and betrayal. The royal banners burn, the people scatter, and the once-proud throne is drowned in shadows. Amid the chaos, a young warrior discovers the Blade of Kings—a weapon whispered to carry the soul of every ruler who ever wielded it. But the blade is not a gift. It is a curse. With each swing, it feeds on his spirit, binding his fate to a destiny he does not understand. To survive, he must choose: embrace the weapon’s dark hunger, or risk watching the last fragments of his world vanish forever. Allies may be traitors, enemies may hold the truth, and every choice cuts deeper than steel. With war rising on every horizon, he carries the weight of a broken kingdom—and the knowledge that even heroes can become monsters. The battle is not for victory. It is for the soul of the fallen kingdom.