Maiden's Power (Fiora)

Maiden's Power is the first skill in 's Innocence skill branch (and thus limited to ). It gives her +50% damage in chain attacks, but only when Shulk is also in the active party.

Overview
More damage is more damage, and Shulk is always in the party at the point when Fiora also is, so it's not obtrusive to try and use. The thing is, since it's NG+ only, it'll probably be completely overkill unless the player is playing DE and has used expert mode to level down to match the enemies.