User blog:Crimson Storm Mich/Guide: UBB and OD System

Thanks to Steverion from AI for allowing me to copy his guide  for UBB and OD gauge mechanics. you can find it here

What is Overdrive (OD) gauge?
Once you have a 7* unit with Ultimate Brave Burst (UBB) unlocked, you will have OD gauge appear on the bottom of battle screen (Between your units and items). Each action you perform (Normal attacking, using BB, using SBB) will fill up the OD gauge.
 * Normal attack gives 300.
 * BB gives 100.
 * SBB gives 200.
 * Any action above used on weaker element gives extra 100 pts.
 * End of turn gives 500.
 * OD Gauge has internal limit from 10,000 to 40,000, with 10k as the first OD gauge requirement.

Once used, OD gauge will increase by 5,000 each time and so on until it reaches 40k. What does this mean?
 * You start off with 10k. Each normal Atk gives 500 so on a team of 6 units, that's 3k per turn. This will takes you 4 turns to fill up your OD gauge to max on your first time. Once you used up your first OD, the limit will becomes 15k. Now, instead of 4 turns of normal Atk, it's a full 5 turns. Once you used up your second OD, it now becomes 20k limit, and so on.
 * Entering OD gauge boost that unit's Atk/Def/Rec by 100%.

What is Ultimate Brave Burst (UBB)?

 * Unlocked after you reached SBB 10.
 * UBB does not have levels. Once you reach SBB 10, you will unlock UBB as well as "Extra Skill", a unique passive ability that ONLY applies to the unit and not for the whole team.
 * Extra Skill may have extra requirement needed to fulfill. (i.e. Selena needs to equip Lexida to activate Extra Skill)
 * UBBs are usually very overpowered, but that's because you can't use it every turn. It could, however a game-changing experience if you manage to control OD/UBB effectively.

How to use UBB

 * First, fill up OD Gauge.
 * Then select the unit you want to use UBB with. Hold and swipe left for that unit to activate Overdrive Mode. Once in OD, that unit will receives 100% Atk/Def/Rec.
 * Your BB gauge will now turn into Ultimate Brave Burst gauge. Use other units to attack and obtain BC to fill up that UBB gauge.
 * OD Mode will ONLY LAST FOR 3 TURNS. Once the 3 turns ended, OD Mode will disappear and your unit will go back to regular BB gauge.
 * It's important that you keep track of the turn and use your UBB before the 3rd turn hits. Also, the unit that's in OD mode can be cursed and therefore unable to use UBB so be careful.
 * Once UBB gauge is filled up, swipe up as if you're doing normal BB and viola! There you have it!