Dux Obscurus

(There was once a peaceful kingdom, until a dark king from another world by the name Diablo conquered it. Diablo's magic created Daemones to keep the kingdom's citizens in line, but also a deadly disease that can rarely be cured. Even if the disease is cured it change the appearance of the infected to resemble a Daemone. Dux is a rebel fighter against Diablo's reign. You be whoever)