[Event] Level 15 Achievement Box (7 Days)

- Description: A box for adventurers who have reached Lv. 15. - You'll get Black Stone x3, Instant HP Potion (Small) x15, [Event] Level 20 Achievement Box (7 Days), [Event] Level 20 Path to Power (1 Day) from the box. - It cannot be used after it expires.

- Additional use requirements are not yet decoded; this is not a complete eligibility check.