Vassal's Blade is a sword exclusive to Karla in Fire Emblem Heroes. While it has a Slaying-type effect, it also increases damage based on the speed difference. The faster Karla is compared to her opponent, 70% of the difference is translated to damage up to +7 extra.
Accelerates Special trigger (cooldown count-1). If unit's Spd > foe's Spd, deals damage equal to 70% of difference between stats. (Maximum bonus of +7 damage. Combos with Phantom Spd.)
- The weapon's design is based on the sword Karla wields in her artwork from Fire Emblem: The Blazing Blade.
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