MapleStory Database › Items › Use items › Character Modification › Mastery Book › [Mastery Book] Hero's Will 20
[Mastery Book] Hero's Will 20
[Mastery Book] Hero's Will 20 is a mastery book (character modification) in GMS v271.
70% chance of increasing the Master Level of to 20.
Job: Jett
Condition: Skill Level 5+