When clicked you enter a tower where you use Energy to do the floors, the higher floor you reach the better the maske reward. Instead of fighting Bosses like in Boss Tower Event, Here you battle Maskes (All guild members attack it) Once a maske has died everyone gets rewards. This only lasts 30 minutes, so go go go!
Note : You need to start over from the first floor everyday, cannot start from floor 3 for gold maskes.
Note : Maske Rebellion gives ridiculous amount of experience, spam this as much as you can during the 30mintues that it's open every day.