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Felicia's Plate + AoE Special — does it work?
Felicia's Plate specifically states "Damage calculated using the lower of foe's Def or Res". It doesn't say anything about it working only during combat.
So Blazing Wind (or any Blazing AoE special, or any Growing/Rising AoE special without the increased multiplier) deals damage in an area equal to 150% of the difference of the unit's Atk and the foe's Def or Res (depending on the unit's weapon). However, Felicia's weapon is able to CHOOSE what defensive stat she targets. What I'm wondering is if she's still able to target her opponent's defensive stat BEFORE battle as well...because if she's able to do so, there's a new way for her to destroy Armor Emblem.

Fate Grand Order
Dragonball Legends
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Heroes