| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| B | 
|
Moon-Twin Wing | 300 | — | At start of combat, if unit's HP ≥ 25%, inflicts Atk/Spd-5 on foe during combat, and also, if unit's Spd > foe's Spd, reduces damage from attacks during combat and from area-of-effect Specials (excluding Røkkr area-of-effect Specials) by percentage = difference between stats × 4 (max 40%). |
|
Moon-Twin Wing+ | 300 | Moon-Twin Wing | If a skill compares unit's Spd to a foe's or ally's Spd, treats unit's Spd as if granted +7. At start of combat, if unit's HP ≥ 25%, inflicts Atk/Spd/Def-5 on foe, unit deals damage = 10% of unit's Atk (excluding area-of-effect Specials), and reduces the percentage of foe's non-Special "reduce damage by X%" skills by 50% during combat (excluding area-of-effect Specials), and also, if unit's Spd > foe's Spd, reduces damage from attacks during combat and from area-of-effect Specials (excluding Røkkr area-of-effect Specials) by percentage = difference between stats × 5 (max 50%). | |
| This skill can only be equipped by its original unit. | |||||
* Unused restrictions: No restrictions.
Effects[ | ]
| Effects | Targets | Conditions |
|---|---|---|
 Moon-Twin Wing | ||
| Combat effects | ||
 Atk/Spd-5 |  Foe |  Unit's HP ≥ 25%at start of combat |
 Reduces damage by X% (max: 40%)X = 4 x ( Unit's Spd - Foe's Spd)from attacks & Non-Røkkr AoE Specials | Unit | Unit's HP ≥ 25% at start of combat & Unit's Spd > Foe's Spd |
 Moon-Twin Wing+ | ||
| Combat effects | ||
| 【Phantom】 Spd +7 | Unit | — |
| Atk/Spd/Def-5 | Foe | Unit's HP ≥ 25% at start of combat |
 Reduces the effect of"Reduces damage by X%" by 50% | ||
 Boosts damage by X%X = 20% of Unit's Spd | Unit | |
| Reduces damage by X% (max: 50%) X = 5 x ( Unit's Spd - Foe's Spd)from attacks & Non-Røkkr AoE Specials | Unit's HP ≥ 25% at start of combat & Unit's Spd > Foe's Spd | |
Notes[ | ]
- The stat decrease that can be applied by Moon-Twin Wing is considered a temporary debuff.
- The damage-reduction effect is calculated after offensive Specials and damage boosting effects such as
Arcane Lúin and Dominance.
- If a skill such as Miracle or Everliving Domain can trigger, the damage-reduction effect will not trigger and the user will still survive with only 1 HP.
- "Reduces damage by X%" effects stack multiplicatively, unlike interactions related to the weapon-triangle, such as Triangle Adept and the weapon-triangle advantage boost.
- Non-Special "reduces damage by X%" effects can be neutralized or reduced by effects such as Share Spoils or Halves non-Special damage reduction.
- For more information, see Damage calculation.
- If a skill such as
- Effects that select units based on stats, such as Chill Def/Res 3, directly select the unit with the appropriate stat(s); they do not compare the team's units pairwise to decide which unit has the highest or lowest stat(s).
- Effects that check if a unit could make follow-up by decreasing the Spd difference, such as Potent 4, are not affected by Moon-Twin Wing+.
- Effects that alter the Spd difference, such as Frozen, are not affected by Moon-Twin Wing+.
- Moon-Twin Wing+ stacks with other effects that treats a unit's Spd as if granted by a certain amount.
- For example, if both Buffer 4 and Phantom Spd 3's effects trigger the unit with both skills will have their Spd treated as if granted +17.
- For example, if both
- Effects that check if a unit could make follow-up by decreasing the Spd difference, such as
- The damage boosting effect of Moon-Twin Wing+ ignores the foe's Def or Res when calculating the damage boost, and can be reduced by damage-reduction effects such as Gust, Atk/Spd Excel, and Dodge.
- A foe equipped with
Embla's Ward, 
Múspellflame, 
Niðavellir Axiom, or Gold Perfection will neutralize all sources of damage during combat except the minimum 1 damage from Umbra Burst weapons. - For more information, see Damage calculation.
- A foe equipped with
- Moon-Twin Wing+ will reduce the effect of non-Special "reduces damage by X%" effects from Specials such as Vital Astra.
- damage-reduction reducing effects stack multiplicatively, unlike interactions related to the weapon-triangle, such as Triangle Adept and the weapon-triangle advantage boost.
- For example, if a unit has Halves non-Special damage reduction and a foe with Dodge is on a space with 【Divine Vein (Water)】, the maximum total damage-reduction is reduced to 10%, since the two effects reduce the damage to (1 − ((40% − 50%) − 50%)) = 90% of the original damage instead of 60% of the original damage.
- For example, if a unit has
- Each damage-reduction effect is reduced individually.
- For example, if a unit has Halves non-Special damage reduction and the foe has both Spurn 4 and Dodge, the maximum total damage-reduction is reduced to 40%, since the two effects reduce the damage to (1 − (50% − 50%)) × (1 − (40% − 50%)) = 60% of the original damage instead of 30% of the original damage.
- For example, if a unit has
- Moon-Twin Wing+ will not reduce the effect of Special "reduces damage by X%" effects such as Gust or Laguz Friend 4.
- For more information, see Damage calculation.
- damage-reduction reducing effects stack multiplicatively, unlike interactions related to the weapon-triangle, such as
List of owners[ | ]
| Unit | Skill chain | |
|---|---|---|
 | Moon-Twin Wing 5  | Moon-Twin Wing+ 5 |
Availability[ | ]
Summoning events
| Start | End | Event | Skill |
|---|---|---|---|
| 2021-06-08 | 2021-06-30 | Book V Mid: Nótt and More | Moon-Twin Wing+ |
| 2021-06-30 | 2021-07-07 | Legendary Heroes - Byleth | Moon-Twin Wing+ |
| 2021-11-30 | 2021-12-14 | Legendary Eitri & Mythic Thórr | Moon-Twin Wing+ |
| 2022-02-28 | 2022-03-14 | Legendary Heroes - Caeda | Moon-Twin Wing+ |
| 2022-03-10 | 2022-03-18 | Book V Revival: Nótt and More | Moon-Twin Wing+ |
| 2022-06-30 | 2022-07-14 | Legendary Heroes - Xander | Moon-Twin Wing+ |
| 2022-09-29 | 2022-10-13 | Legendary Heroes - Ninian | Moon-Twin Wing+ |
| 2023-03-31 | 2023-04-14 | Legendary Heroes - Yuri | Moon-Twin Wing+ |
| 2023-08-31 | 2023-09-14 | Legendary Heroes - Alear | Moon-Twin Wing+ |
| 2024-02-11 | 2024-02-25 | Legendary & Mythic Hero Remix 1 | Moon-Twin Wing+ |
| 2024-07-11 | 2024-07-25 | Legendary & Mythic Hero Remix 1 | Moon-Twin Wing+ |
Distributed units
- This skill is not available on any distributed units.
Combat Manuals
- This skill has not been available on any distributed Combat Manuals.
In other languages[ | ]
| Language | Name |
|---|---|
| Japanese | 双姫の月翼 |
| German | Mondflügel |
| Spanish (Europe) | Ala gemela lunar |
| Spanish (Latin America) | Ala gemela lunar |
| French | Aile sœur-lunaire |
| Italian | Ala lunare |
| Traditional Chinese (Taiwan) | 雙姬的月翼 |
| Portuguese | Asa gêmea lua |