A City Called Cerveteri
He is a former mercenary called to be a medic and support on the front lines. His team was mainly used for defense missions. His team was annihilated one day by an ambush of an enemy nation while guarding an outpost stronghold and he was the only one left alive. He felt responsible for it and so left the mercenary business altogether to further pursue his religion more. His experience as a mercenary was invaluable so after a few years, he was convinced by his compatriots to get a job in the weapons dealing business to help out.
He just wants to atone for his mistakes of his past and protect his new friends.