The Regressor's Instant Skill Mastery

Reborn into a brutal fantasy world besieged by monstrous demon lords, Baler was a nobody—his precious past-life experience swiftly fading. Without a \"job\" to anchor his knowledge, he faced an anonymous, powerless death in a realm where only strength survived. But Baler harbored a game-breaking secret: a unique System that allowed him to instantly master any skill with a single allocation! Monster tracing, ancient swordsmanship, battlefield command—all perfected in mere moments. In three months, he transformed from a novice into an unstoppable, strategic genius, effortlessly dominating and blowing the minds of veteran warriors. He was the \"hero without blood or tears,\" coldly calculating every move, his progression shocking even the most gifted. Now, as a mercenary rewriting the rules of war, he discovers the \"heroes\" he once revered are shockingly self-serving, potentially more dangerous than the demons. Can this cheat-powered regressor save a world that's seemingly blind to its true enemies and plagued by the very \"champions\" meant to protect it?