Harp's Sealed Rune of Magic (3-day)
When in inventory, INT +7. With a 10% chance, decreases M. Def. of the target and all enemies in the range of 400 for 10 sec. on a magic attack.
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.