Attack/Speed Ruse (Japanese: 攻撃速さの大共謀Great Attack/Speed Conspiracy) is a three-tiered passive type B skill which debuted in Fire Emblem Heroes; the individual tiers of the skill are known as Atk/Spd Ruse 1, Atk/Spd Ruse 2, and Atk/Spd Ruse 3 in order from lowest to highest. Units with an Atk/Spd Ruse skill, when the user is either the user or recipient of a rally assist skill, drastically drops both the Attack and Speed of enemies in cardinal directions of both allies involved through their following actions and inflicts the Guard status on those same enemies, slowing their special cooldown per attack by -1; the size of the Attack and Speed drops are affected by the skill's tier.
If user is involved in a rally assist skill as either user or recipient, reduces Attack and Speed of all enemies in cardinal directions of both units by -1 each and inflicts special cooldown -1 per attack during combat on all affected enemies through their following actions.
If user is involved in a rally assist skill as either user or recipient, reduces Attack and Speed of all enemies in cardinal directions of both units by -3 each through their following actions and inflicts special cooldown -1 per attack during combat on all affected enemies through their following actions.