War of EmperiumEdit
Also known as "Guild War" or "Siege", for two hours on any day of the week (depending on the server) an event called War of Emperium (commonly abbreviated "WoE") takes place. Guilds that have obtained the Seal of Approval skill may attempt to enter and gain control of a series of castles available in-game. On the fourth floor of each castle lies the Emperium; if a guild breaks another guild's Emperium, that guild gains control of the castle. If a guild can maintain control of a castle until the end of the War of Emperium it will retain control until the next War of Emperium and may gain a variety of benefits for victory, including access to special 'Guild Dungeons' if certain castles are controlled, which give the members of the holding guild a definite advantage in gaining experience and items. During War of Emperium hours, the castle maps are set in PvP mode and behave much the same as the standard PvP maps with a few exceptions, in particular the lack of damage indicators and a large decrease to the effectiveness of magic, skills, and ranged attacks. War of Emperium is the most popular feature of the game and most players participate in it at least once per week.