[DFFOO JP][Arc 3 Ch6 Pt 2 Lufenia+] Trap edition with Ace and Lv.90 Vanille, Leila for evasion
13This run is mostly about Vanille's C90 awakening. Ace is there for more traps and because I haven't used him after Machina's BT came out.
Character Compatibility:
The idea is mostly just to get the most out of the enemy turns. Since Leila herself requires the boss to do something to let her dodge for most of her benefits from the LD, Vanille and Ace are relatively more compatible with that style for letting the boss trigger traps for extra damage. If it is a turn hogger like Vayne, then Leila's presence probably is just for initiating his chain of turns in case the boss gets a turn or has some obnoxious mechanics like Divine Shiva.
Vanille's C90:
Vanille does not get a skill rework, but a potent EX extension and C88. While her base skills and LD are still at 1 HP dump, her EX gets significantly better. Not only it has 3 HP dumps with BRV dmg refund in between, her trap also transform from a dispelling BRV attack with no HP damage into a 2 HP dump attack. Considering how fast her EX recharges (around 1 and half skill or so), her damage overall can stack up quite well especially if the boss has a good cadence of getting turns and trigger the trap (EX + trap = 5 HP dumps). She is much better to use now in a party than she was. Also, that triggering the trap BRV refunds the entire party according to its damage, so overall she is less likely to get broken than before and she would offer a lot more battery now.
That said, you may want to choose which boss and what type of characters to bring along with her. Again with character compatibility, if you bring someone like Noel or Vayne who keeps rebreaking and pushing the boss away, her damage may be much less desirable.
Other than transforming her EX into a decent attack, it also gives herself 50% BRV dmg up and 30% BRV gain up with overflow. Combining with her very potent defence debuff (taking into account her armor as well, she on her own can give 120% DEF down) and extra BRV dmg up from LD, she should have little problem dealing high BRV dmg and getting battery.
Other than setting trap off, Ace's trap also stacks additional DEF down on top of Vanille's generic debuffs. Therefore they synergize really well together in terms of playstyle and damage boosting.
Vanille's C88 is relatively simplistic but party-oriented. It gives 30% ATK up and 20% BRV cap up now. So with Leila's own C88 party-wide BRV cap increase, some characters can benefit alot from it if they cannot reach max HP damage threshold on their own e.g. Noel, Gilgamesh. I think it is also why in that Leila trailer, she was dealing crazy amount of BRV damage.
Overall, Vanille is in a much better place than she was when her LD came out. She can deal damage if you let her, but that may require you to adjust your party composition and how you approach the boss. Some fight may be more suitable than others to bring her along, especially if it is a boss that constantly cleanse and have really high defence that cannot be neutralized with Fran and Jack LDCA. If you are using Locke's BT to grant the party ignore defence, than she may be less desirable to be in the party.