There are 3 waves of lufenia+;
At wave 1 we can't recover BRV at all but the orb requires us to deal at least 400k damage after one ally's consecutive turn or at least 100k at the end of an ally's turn. This is quite a big deal because our BRV is limited. I used Beatrix to counter and for tank, and Garnet for aurabot.
At wave 2, the Bahamut is unlaunchable, and will summon Penelo manikin at some HP Threshold (watch out, her evanescence damage is VERY big if you give her a turn to act). The orb requires us to deal crit damage.
At wave 3, the enemies are immune to all kind of debuff, but they have silver framed buffs that have stacks (max 3). The orb require us to deal holy damage or HP regen.
Note: all of the enemies above are unbreakable but they can be delayed with normal delay somehow
Enjoy!
Credit:
Main theme 1: Final Fantasy 12 TZA - Lust for Power
Main theme 2: Final Fantasy Tactics - Apoplexy