Proofs of Battle Readiness
An item obtained by defeating the Dark Wizard of the Magic Circle in the Beleth's Magic Circle area of Hellbound, or the Scorpion King in the Phantasmal Ridge area. Collect and take it to the Fire Dragon Bride Leona Blackbird in the Hellbound Refugee Camp.
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.