Proof of a Warrior 30-day limited period
Noble proof representing bravery. Needed to use the Buff of Virtue, Silence of Fidelity, and Vitality of Courage with the opera mask. Cannot be exchanged, dropped, or sold. Can be stored in a private warehouse.
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.