User blog comment:Mich, Michele & Kuhla/Guide: UBB and the OD gauge/@comment-68.98.29.49-20150314204943/@comment-26454549-20150621154157

I have a 7* Sefia and her UBB multiples the numbers of hits and adds 99,999 HP each turn for 3 turns so in my case its great since a lot of my units have over 13,000 HP.