Talk:Hero Crystal/@comment-68.189.10.13-20150328232245/@comment-58.170.194.67-20150329015337

The overdrive gauge is the gauge that needs to be filled in order to use ultimate brave burst - the new powered up version of the super brave burst (only available to 7* monsters)

http://bravefrontierglobal.wikia.com/wiki/Gameplay:Brave_Burst