Growth Rune (30-day)
If stored in the inventory, acquired XP/ SP +20%. Can be used with both Nevit's Rune and Nevit's Rune (Dragon Rising). If used with Emperor's Rune, only the effect of Emperor's Rune applies.
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.