Lull Speed/Defense is a three-tiered passive type B skill which debuted in Fire Emblem Heroes; the individual tiers of the skill are known as Lull Spd/Def 1, Lull Spd/Def 2 and Lull Spd/Def 3 in order from lowest to highest. Units with a Lull Spd/Def skill, during combat, both reduces the target's Speed and Defense and neutralizes any bonuses to those stats granted by skills such as a Fortify or Rally; the size of both stat drops increase with the skill's tier.