Emyr came from a large goblin tribe, one rivaling a city with the amount of people in it. As most of these tend to be, the Jabberwock tribe as they called themselves was also a tribe of raiders, terrifying swarms of goblins commanded by Bugbears, and the nobble smart hobgoblin sitting at the top.
Emyr, was not at the top despite his ancestary however, his father leaving the tribe put him in such a bad station he was treated like a goblin, in fact sometimes worse. What came out of it wasn't a broken man however, it was rage, rage he directed towards any caravans, villages or blossoming cities they raided, He used to take a sick satisfaction in seeing people fear him, guilty innocent didn't matter to him as long as they felt like they'd die before Emyr even touched them with his spear.
Until one of the raids went horribly wrong, a group of adventurers baring every magical item they could ambushed the raid camp, an uncommon sight in a place where these kinds of people probably have nothing else to do. Goblins were killed, hobgoblins were captured. Emyr knew he would die as soon as they realised he was just a foot soldier so he made a bargain, give them all his equipment and the exact location of the tribe and in return he gets to live. By some miracle the adventurers took that deal and kept their end of the bargain.
First place he wanted to go, out of here. He scrounged up what little money he could and did weeks of back breaking labour to reach the new world. He no longer had anyone to boss him around, and no one to come after him either and with this new world expanding everywhere he could finally have a challenge and see fear in the eyes of that challenge when he conquers it
Tl;Dr: Edgy mc edgeface sells his tribe out then sails to the new world to be creepy and kill stuff