Atreus was a member of a clan of humans in the mountanous regions of the mainland. Known for his stubborn resolve, and refusal to give in, no matter the injuries dealt to him. His clan had spent years avoiding the orcs other than brief skirmishes because they knew outright war with them would lead to destruction. However the God they worshipped, Pan-Heon, commanded the clan to join the God in battle against the orcs and the demon Asno. The clan, trusting in their God joined him in battle but in single combat against Asno, Pan-Heon was slaughtered and the orcs killed almost all of the clan.
Atreus was one of the few survivors and now despises both gods and orcs. He thinks humans are stronger without the gods, who only want to prolong the war between orcs and men.