A list of Support Skills currently available in Fire Emblem Heroes.
Support Skills

Skills

Support Skills List

Skill Effect
Rally Attack Grants Atk+4 to an adjacent ally until the end of the turn.
Swap Swap places with an adjacent ally.
Pivot Unit moves to opposite side of adjacent ally.
Sing Enables target to take another action. Cannot be used on units with Sing or Dance
Dance Enables target to take another action. Cannot be used on units with Sing or Dance
Reciprocal Aid Swap HP with adjacent ally (neither unit can go above their max HP).
Heal Restores 5 HP.
Reconcile Restores 7 HP each to target and this unit.
Martyr Restores HP=7+this unit's suffered damage. Unit heals HP=half suffered damage. Slows Special trigger (cooldown count+1).
Reposition Moves adjacent ally to opposite side of unit.
Smite Push adjacent ally 2 spaces farther away.
Ardent Sacrifice Heals adjacent ally 10 HP. Unit loses 10HP (but cannot reach 0 this way)
Draw Back Unit moves 1 space away from target ally, who moves to unit's former position.
Mend Restores 10 HP.
Physic Restores 8 HP. Rng 2.
Shove Push adjacent ally 1 space farther away.
Recover Restores 15 HP. Slows Special trigger (cooldown count +1)
Rally Resistance Grants Res+4 to an adjacent ally until the end of the turn.
Rally Speed Grants Spd +4 to an adjacent ally until the end of the turn
Harsh Command Converts penalties on target into bonuses.
Rehabilitate Restores 7 HP or more the further below 50% the target's HP is. Slows special trigger (cooldown count+1).
Rally Defense Grants Def+4 to an adjacent ally until the end of the turn.
Rally Atk/Spd Grants Atk/Spd +3 to an adjacent ally until the end of the turn.
Rally Def/Res Grants Def/Res+3 to an adjacent ally until the end of the turn.
Rally Atk/Res Grants Atk/Res+3 to an adjacent ally until the end of the turn.
Rally Spd/Def Grants Spd/Def+3 to an adjacent ally until the end of the turn.
Rally Spd/Res Grants Spd/Res+3 to an adjacent ally until the end of the turn.
Physic+ Restores HP = 50% of Atk. (Minimum of 8 HP.)
Recover+ Restores HP = 50% of Atk +10. (Minimum of 15 HP.)
Martyr+ Restores HP = this unit's suffered damage +50% of Atk. (Minimum of 7 HP.) Also restores HP to unit = half suffered damage.
Rehabilitate+ Restores HP = 50% of Atk -10. (Minimum of 7 HP.) If target's HP is ≤ 50%, the lower the target's HP, the more HP is restored.
Rally Atk/Def Grants Atk/Def+3 to an adjacent ally until the end of the turn.
Sacrifice Converts penalties on target into bonuses. Restores target's HP = unit's current HP -1. Unit's HP reduced by amount restored.
Restore Restores 8 HP. (Minimum of 8 HP.) Neutralizes ally's penalties (from skills like Panic, Threaten, etc.) and negative status effects (preventing counterattacks, restricting movement, etc.) that last through ally's next action.
Restore+ Restores HP = 50% of Atk. (Minimum of 8 HP.) Neutralizes ally's penalties (from skills like Panic, Threaten, etc.) and negative status effects (preventing counterattacks, restricting movement, etc.) that last through ally's next action.
Future Vision Unit and target ally swap spaces. Grants another action to unit. (Additional action granted once per turn only.)
Rally Spd/Def+ Grants Spd/Def+6 to target ally for 1 turn.
Rally Up Atk+ Grants Atk+6 to target ally and allies within 2 spaces of target (excluding unit) for 1 turn.
Rally Up Atk Grants Atk+3 to target ally and allies within 2 spaces of target (excluding unit) for 1 turn.