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BD is an assistant class. It should be included in every party. His role is to dance, stay alive and close enough to his party. He is not a char to make pvp with, even if he rox in oly, cause it's self-buff only, but who goes open field pvp in self buff? :P
Creating a BD to make a lot of pvps is absolutely pointless... There are characters, who are much more effective in this field (Archers, daggers, nukers etc...)