[Event] Sealed Book of Combat (20 Days)

Press Secondary Attack to unseal, and get the [Event] Book of Combat (20 Days).
Press Secondary Attack on the Book of Combat (20 Days) to get Combat EXP +100% and Skill EXP +50% for 24 hours.

(If the Book of Combat is already in use, you can unseal a new Sealed Book of Combat after it expires.)