Speed/Resistance Bond is a three-tiered passive type A skill which debuted in Fire Emblem Heroes; the individual tiers of the skill are known as Spd/Res Bond 1, Spd/Res Bond 2, and Spd/Res Bond 3 in order from lowest to highest. Units with a Spd/Res Bond skill boost their Speed and Resistance during combat provided they have an adjacent ally; the size of the Speed and Resistance boosts are affected by the skill's tier.