Talk:Special Events/@comment-26116989-20150331221450/@comment-118.136.177.121-20150401153912

In addition that you only need 1 7* most of the time (though more is acceeptable), there's great chance that you can only activated one of their UBB at a time. So it better to bring different 7* and use their skills depending on the situation, since you can only activated one and need to refill the overdrive gauge aswell.