Years ago, us humans started to subjugate goblins because of one premonition of the Saint.
"A monster with the power of a God shall be born among the goblins and he shall break free the peace of the continent."
We didn't really believed in her at that time but either way, a monster with that kind of strength sure is a nightmare for us.
But even after doing all that, he survived.
After a year or so from that subjugation, the monsters around that part got rowdy and started encroaching on human borders. Kings sent their soldiers, church sent their priests and adventurers went to stop it but nothing can stop the advance of the army led by that monster.
After that, he came and conquered the lands, sea and even the sky.
People call him many names but the one that can describe him the most is...
Human king!