Character design from a video game world building idea with a few friends.

The Plague Doctors roam the Kingdom in small squads, eradicating potential sources of infection. They fill the tips of their helmets with medicinal herbs burning in sacred flames, and wrap their bodies with blessed oils.
Over time, and with the spread of the virus, their role has evolved from doctors to executioners, at times wiping out entire villages at the slightest suspicion, all in the name of the Kingdom's safety.