I Killed the Hero and Took His Achievements

The “Chosen One” tried to debate ethics with the Final Boss. The result? Humanity was wiped out. I was the F-Rank porter who watched it happen. Then, I woke up twenty years in the past; ten minutes before the apocalypse began. I looked at the naive young Hero standing next to me. I didn't join his party. I stabbed him in the throat. [System: You have killed the Protagonist.] [Reward: SSS-Rank Trait “The Usurper” Acquired.] [Passive: Absolute 100% Drop Rate.] Now, the destiny of the world is mine. I don't grind. I take. Touch a Grand Mage? Skill Copied. Kill a Dragon? Talents Absorbed. Save the Princess? Only if she can afford the subscription fee. While the world panics, I’m fusing prohibited skills and privatizing the dungeons. I’m not here to save the world. I’m here to loot it. [Add to Library to join the harvest.]