Was strong. Was smart. Traded with Humans. Rags and Garen exchanged looks. “Traded?” The Gold Stone Chieftain nodded importantly as he relayed this information while they ate. The Goblin King had had a tribe larger than any other, and he had been largely peaceful. He had been a Goblin Chieftain at first, and then a Goblin Lord, and then had come the day when others called him Goblin King. It had been glorious, apparently. What few scraps the Gold Stone Chieftain could recall was of his ancestors being happy, fed, and safe. But then something…bad had happened, and there had been war. Terrible
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7 volumes in and we still have no idea what the rest of the world did to piss him off so much.
From the set-up -- i'm 99% sure it wasn't the Goblins' fault