Goblin Slayer: Goblin's Crown

Humanity has been at war with various monsters for an extended period, but people have grown accustomed to it. For those seeking adventure and rewards, there's a guild where anyone can accept quests and battle monsters. Among these monsters, goblins are considered the weakest and offer minimal rewards. Goblins are generally solitary, unintelligent, and easy to defeat. However, some goblins are significantly more powerful, intelligent, and dangerous than their weaker counterparts. Together, they form a formidable force that can challenge even experienced adventurers, but few recognize this. Goblin Slayer, also known as Orcbolg or Beard-cutter, is an underrated silver-ranked adventurer who, for unknown reasons, only accepts goblin-slaying quests. What is his mysterious past?