| Type | Icon | Name | SP | Required | Description 【Switch】
| |
|---|---|---|---|---|---|---|
| C | 
|
Opened Domain | 300 | — | At start of turn, if unit is within 2 spaces of any allies from a different title than unit, grants 【Resonance: Blades】and【Resonance: Shields】to unit and all allies within 2 spaces of unit, and also, if unit or any of those allies has their Special cooldown count at its maximum value, grants Special cooldown count-1 to them. | At start of turn, if unit is within 2 spaces of any allies from a different title than unit, grants 【Resonance: Blades】and【Resonance: Shields】to unit and all allies within 2 spaces of unit, and also, if unit or any of those allies has their Special cooldown count at its maximum value, grants Special cooldown count-1 to them. 【Resonance: Blades】 Grants Atk/Spd+4 during combat for 1 turn. 【Resonance: Shields】 Grants Def/Res+4 during combat and the following effect for 1 turn: "During unit's first combat in player phase or enemy phase, foe cannot make a follow-up attack." |
 | Opened Domain+ | 300 | Opened Domain | If unit can transform, transformation effects gain "if unit is within 2 spaces of any allies from a different title than unit" as a trigger condition (in addition to existing conditions). If defending in Aether Raids, at the start of enemy turn 1, if conditions for transforming are met, unit transforms. At start of turn, and at start of enemy phase (except for in Summoner Duels), if unit is within 3 spaces of any allies from a different title than unit, grants Atk/Def+6,【Resonance: Blades】and 【Resonance: Shields】to unit and allies within 3 spaces of unit for 1 turn, and also, for unit and allies within 3 spaces of unit, if Special cooldown count is at its maximum value, grants Special cooldown count-1. If unit is within 3 spaces of an ally, grants Atk/Def/Res+5 to unit and reduces damage from foe's attacks by 7 during combat (excluding area-of-effect Specials), and also, if unit's Def ≥ foe's Def+5, disables unit's and foe's effects that change attack priority. If unit is within 3 spaces of an ally, for unit and allies within 3 spaces of unit, if Special cooldown count is at its maximum value after combat, grants Special cooldown count-1. | If unit can transform, transformation effects gain "if unit is within 2 spaces of any allies from a different title than unit" as a trigger condition (in addition to existing conditions). If defending in Aether Raids, at the start of enemy turn 1, if conditions for transforming are met, unit transforms. At start of turn, and at start of enemy phase (except for in Summoner Duels), if unit is within 3 spaces of any allies from a different title than unit, grants Atk/Def+6,【Resonance: Blades】and 【Resonance: Shields】to unit and allies within 3 spaces of unit for 1 turn, and also, for unit and allies within 3 spaces of unit, if Special cooldown count is at its maximum value, grants Special cooldown count-1. If unit is within 3 spaces of an ally, grants Atk/Def/Res+5 to unit and reduces damage from foe's attacks by 7 during combat (excluding area-of-effect Specials), and also, if unit's Def ≥ foe's Def+5, disables unit's and foe's effects that change attack priority. If unit is within 3 spaces of an ally, for unit and allies within 3 spaces of unit, if Special cooldown count is at its maximum value after combat, grants Special cooldown count-1. 【Resonance: Blades】 Grants Atk/Spd+4 during combat for 1 turn. 【Resonance: Shields】 Grants Def/Res+4 during combat and the following effect for 1 turn: "During unit's first combat in player phase or enemy phase, foe cannot make a follow-up attack." | |
| This skill can only be equipped by its original unit. | ||||||
* Unused restrictions: No restrictions.
Effects[]
| Effects | Targets | Conditions |
|---|---|---|
 Opened Domain | ||
| Status effects | ||
 Resonance: Blades |  Unit &  Allieswithin 2 spaces | At start of turn if an Ally froma different title is within 2 spaces |
 Resonance: Shields | ||
| Map effects | ||
 Special cooldown count-1 | Unit & Allies within 2 spaces | ( Resonance: Blades conditions) & Unit or Ally's CD is max value |
 Opened Domain+ | ||
| Status effects | ||
 Atk/Def+6 | Unit & Allies within 3 spaces | At start of turn & Enemy Phase* if an Ally froma different title is within 3 spaces |
| Resonance: Blades | ||
| Resonance: Shields | ||
| Map effects | ||
 Adds "if an Ally froma different title is within 2 spaces" to transform conditions | Unit | — |
 Transforms if defendingin Aether Raids & conditions are met | At start of Enemy Turn 1 | |
| Special cooldown count-1 | Unit & Allies within 3 spaces | ( Atk/Def+6 conditions) & Unit or Ally's CD is max value |
| Special cooldown count-1 | Unit | After combat if an Ally iswithin 3 spaces |
| Special cooldown count-1 | Allies within 3 spaces | After combat if Ally's CDis max value |
| Combat effects | ||
 Atk/Def/Res+5 | Unit | An Ally is within 3 spaces |
 Reduces damage by 7from  Foe's attacks | ||
 Neutralizes prioritychanging effects | Unit & Foe | An Ally is within 3 spaces & Unit's Def ≥ Foe's Def+5 |
* Excluding Enemy Phase in Summoner Duels.
Notes[]
- The effects of Opened Domain will only be granted to the user and allies within 2 spaces (regardless of titles), if there is an ally from a different title than the user within 2 spaces.
- Opened Domain applies the
Resonance: Blades status effect.
- Any 【Bonus】 effect on a unit lasts until the start of that unit's next phase. If Resonance: Blades is acquired during the enemy phase, it will disappear when the next player phase begins.
- Any 【Bonus】 effect on a unit lasts until the start of that unit's next phase. If
- The Atk/Spd+4 that can be applied during combat by Resonance: Blades is considered a temporary buff.
- Opened Domain applies the Resonance: Shields status effect.
- Any 【Bonus】 effect on a unit lasts until the start of that unit's next phase. If Resonance: Shields is acquired during the enemy phase, it will disappear when the next player phase begins.
- Any 【Bonus】 effect on a unit lasts until the start of that unit's next phase. If
- The Def/Res+4 that can be applied during combat by Resonance: Shields is considered a temporary buff.
- The follow-up preventing effect of Resonance: Shields only activates during the first combat that the user enters during either phase of that turn.
- If the user or a foe has any skills that neutralize or stack with Resonance: Shields's follow-up preventing effect, those effects will only stack or be neutralized during the first combat that the user enters during either phase of that turn.
- If the user or a foe has any skills that neutralize or stack with
- Resonance: Shields can prevent the foe from making a standard follow-up attack.
- As a general rule, if a unit is both prevented from making, and guaranteed to make a standard follow-up attack, the effects cancel out, and the Spd difference is used (including effects that alter the Spd difference such as Frozen).
- Resonance: Shields will not prevent a unit with a "unit attacks twice" effect from performing the 2 consecutive attacks, but the the unit will not be able to perform a standard follow-up attack.
- Resonance: Shields will not prevent the additional follow-up attack of Potent Follow effects.
- Effects such as Mag. Null Follow or Null Follow-Up will neutralize the follow-up preventing effect of Resonance: Shields.
- As a general rule, if a unit is both prevented from making, and guaranteed to make a standard follow-up attack, the effects cancel out, and the Spd difference is used (including effects that alter the Spd difference such as
- Opened Domain's cooldown count changing effect will not trigger if the unit is inflicted with False Start, unless False Start is removed by a skill such as Dream Deliverer.
- Cooldown count changes from skills that activate at the same time as Opened Domain (at start of turn) are not considered in Opened Domain's conditions.[1] Skills such as Infantry Pulse 4, Buffer 4, and Odd Pulse Tie 3 will have their effects stack.
- The additional transformation conditions added by Opened Domain+ allow the user to transform if either the regular transformation conditions or the additional transformation conditions are met.
- Effects that remove transformation conditions will remove both the regular and additional transformation conditions.
- The stat increase that can be applied by Opened Domain+ is considered a Bonus.
- The stat boost that can be applied during combat by Opened Domain+ is considered a temporary buff.
- The flat damage-reduction effect is a flat -7 damage that is calculated after offensive Specials, damage boosting effects such as Arcane Lúin and Dominance, and "reduces damage by X%" effects such as Gust and Dodge.
- 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.
- Umbra Burst weapons will always deal a minimum of 1 damage even if the foe is equipped with
Invincible Sister, 
Vengeful God, Invincibility Seals, or damage reduction effects. - Flat damage-reduction effects stack additively, similar to damage boosting effects and interactions related to the weapon-triangle, such as Triangle Adept and the weapon-triangle advantage boost.
- Flat damage-reduction effects cannot be neutralized or reduced only during combat by effects such as Share Spoils+ or Halves non-Special damage reduction.
- For more information, see Damage calculation.
- If a skill such as
- Opened Domain+ only neutralizes effects that change the priority, or order of attacks, such as Desperation, Vantage, and Paranoia.
- Effects such as Guaranteed follow-ups during combat, which do not change the order, but rather guarantee that an attack will occur in whatever order is natural, are not affected.
- Effects such as
- Opened Domain+ triggers before after combat Specials such as Galeforce and Røkkr AoE Specials.
- Cooldown count changes from effects that activate at the same time as Opened Domain+ (after combat) are not considered in Opened Domain+'s conditions. Effects such as Special Spiral 4, Prof's Guidance, and Pulse Smog will have their effects stack.
List of owners[]
| Unit | Skill chain | |
|---|---|---|
 | Opened Domain 5  | Opened Domain+ 5 |
 | Opened Domain 5 | – |
Availability[]
Summoning events
| Start | End | Event | Skill |
|---|---|---|---|
| 2022-07-26 | 2022-08-09 | Mythic Heroes - Askr | Opened Domain |
| 2022-10-31 | 2022-11-14 | Mythic Heroes - Arval | Opened Domain |
| 2023-01-01 | 2023-02-01 | Gods Renewed | Opened Domain |
| 2023-02-02 | 2023-03-02 | Special Hero Summon | Opened Domain |
| 2023-03-31 | 2023-04-14 | Legendary Heroes - Yuri | Opened Domain |
| 2023-04-13 | 2023-04-27 | Focus: Double Special Heroes | Opened Domain |
| 2023-06-30 | 2023-07-14 | Legendary Heroes - Guinivere | Opened Domain |
| 2023-10-11 | 2023-10-25 | Focus: Double Special Heroes | Opened Domain |
| 2023-12-25 | 2024-01-08 | Camilla: Alluring Darkness | Opened Domain |
| 2024-01-01 | 2024-02-01 | New Year: ω Special Heroes 1 | Opened Domain |
| 2024-05-31 | 2024-06-14 | Legendary Heroes - Corrin | Opened Domain |
| 2025-01-01 | 2025-02-01 | New Year: ω Special Heroes 1 | Opened Domain |
| 2025-03-11 | 2025-03-25 | Legendary & Mythic Hero Remix 1 | Opened Domain |
| 2025-09-09 | 2025-09-23 | Legendary & Mythic Hero Remix 2 | Opened Domain+ |
| 2026-01-01 | 2026-02-01 | NY: ω Special Heroes 2 (4★SHSR) | Opened Domain |
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 | みんなが繋がる世界 |
| German | Offenes Gebiet |
| Spanish (Europe) | Dominio abierto |
| Spanish (Latin America) | Dominio abierto |
| French | Domaine ouvert |
| Italian | Dominio aperto |
| Traditional Chinese (Taiwan) | 彼此相連的世界 |
| Portuguese | Domínio aberto |