I Killed a Goblin, So Why Did It Drop a Max-Level Forbidden Spell?

[System Compendium] [Multiple Love Interests] [Decisive and Ruthless] [Overpowered Power Fantasy] [No Doormat Protagonist]

After transmigrating to a fantasy continent of swords and magic, Ryan starts out as a dirt-poor country villager, and nearly gets his first kill stolen by a few goblins!

Luckily, the Compendium of Myriad Worlds' Monsters awakens! By killing monsters, he can extract their talents and even trigger mutations and evolutions!

Kill goblin grunts and get god-tier stealth, becoming a shadow assassin!

Kill goblin mages and get Magic Missile, then blow up forbidden spells with one hand!

Kill a succubus... Wait, why is this talent drop a little weird?!

By the time Ryan has fought his way from the Novice Village to the royal capital, everyone discovers that the man known as the "Monster Butcher" has long been surrounded by haughty noble young ladies, gentle childhood friends, a cold elf queen, and a scheming female knight...

Ryan spreads his hands helplessly: "All I wanted was to fight monsters and level up. They're the ones who insist on giving me an easy life!"