Brave Frontier

I'm very confused by it. Uses party BB gauge then refills 999 BC... Does that mean it can be used until overdrive ends? There's a few unknown parameters I'm confused about as well.

UBB: 70 Hits, 1200% (ATK+200) + Unknown proc (61) {+4000%?} + Unknown proc (62) {Light element or prevents light elemental damage, 10,000 HP Shield?} + Fill 999 BC

So the first unknown param (61) does up to an additional 4000% damage depending on how much BB gauge he uses from his party. I'd have to assume if everyone has full SBB when he uses his UBB then he'll do the max 4000%.
The second unknown param (62) gives the entire party a 10k shield that absorbs light elemental damage and it's a permanent shield for the entire duration of the battle, unless removed by other sources.

https://www.reddit.com/r/bravefrontier/c...15/ctlt0hy

Basically if you have a full team with SBB ready and you use Lucius UBB. He'll do 70 Hits for 1200% (ATK+200) + an additional 4000% on top of it and then give the entire party 999BC worth. I'm actually not too sure if this would allow him to use UBB again. I'd have to imagine not, but considering it's Lucius anything's possible.