Cain is the Cain from the bible, he is married to Amara, aka the darkness and gods sister, who he met when he was still with his parents, Adam and eve, and brother, Abel. Due to his and Amara's relationship, chuck aka God, gave him a mark so he will live as long as he and Amara wishes. Cain is often led by logic and reason, and is very organized. He knows how to make stuff happen. He runs a hunters equipment shop with angel and demon enchanted equipment and various supplies like holy water.