Mark of Kargos
Certificate proving that you are on a mission given by Kargos, captain of the 3rd unit of Elmore Knights. Bring this to Kitchen, a knight disguised as a pagan in the Pagan Temple, and he will give you your next mission.
Not dropped by monsters.
Cannot be spoiled.
The chances are official (x1). On servers with x10, x100 and higher rates, drop and spoil come more often.