[Event] Level 50 Achievement Box (7 days)

- Description: A box for Adventurers who have reached Lv. 50. It cannot be used after it expires. - You'll get Black Stone x20, Magic Crystal of Infinity - Experience, Professional Worker Contract Bundle, [Event] Level 55 Path to Power (7 days), [Event] Level 55 Achievement Box (7 days).

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