You can take part in Guild Battle after reaching level 30 and joining a guild. Guild Battle starts at 20:39 every night and only top 8 guilds on the guild rankings are qualified.
There are two sides in Guild Battle, the defending guild and the attacking guilds.
If all the statues are destroyed by the end of the event, the attacking guilds will be the winner. Otherwise, the defending guild will be declared the winner.
If the attacking guilds win, the guild with the highest points will be the next defending guild.
If one guild will successfully hold back the attack for two or more days in a row, the attack guilds will receive a BUFF. The more days the defending guild holds in a row, the stronger the buff will be.