Talk:Hellion Armor Reis/@comment-124.13.21.123-20150826124700/@comment-24364845-20150827214229

Get a 7* unit to SBB10 to unlock its UBB.

During a battle, if you have a unit in your party (friend or yours) with UBB unlocked, an "Overdrive" gauge will appear. Just fill that up, select that unit and swipe left to use the UBB. UBB has a separate gauge you need to fill before you can use it so it usually takes 2 turns before you can use it, especially if you don't have any Fuujin. Keep that in mind, especially during hard contents like Trials.