| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| C | 
|
Def/Res Oath 1 | 60 | — | At start of turn, if unit is adjacent to an ally, grants Def/Res+3 to unit for 1 turn. |
|
Def/Res Oath 2 | 120 | Def/Res Oath 1 | At start of turn, if unit is adjacent to an ally, grants Def/Res+4 to unit for 1 turn. | |
|
Def/Res Oath 3 | 240 | Def/Res Oath 2 | At start of turn, if unit is adjacent to an ally, grants Def/Res+5 to unit for 1 turn. | |
|
Def/Res Oath 4 | 300 | Def/Res Oath 3 | At start of turn, if unit is within 2 spaces of an ally, grants Def/Res+6 and the following status to unit for 1 turn: "Unit can move to a space adjacent to any ally within 2 spaces." If unit is within 2 spaces of an ally, grants Def/Res+3 to unit during combat. | |
Cannot use:  
| |||||
Effects
| Effects | Targets | Conditions |
|---|---|---|
 Def/Res Oath 3 | ||
| Status effects | ||
 Def/Res+5 |  Unit | At start of turn if Unit is adjacent to an Ally |
 Def/Res Oath 4 | ||
| Status effects | ||
| Def/Res+6 | Unit | At start of turn if Unit iswithin 2 spaces of an Ally |
 Air Orders | ||
| Combat effects | ||
 Def/Res+3 | Unit | Unit is within 2 spaces of an Ally |
Notes
- The stat increase that can be applied by Def/Res Oath is considered a Bonus.
- Def/Res Oath 4 applies the Air Orders status effect.
- Any 【Bonus】 on a unit lasts until the start of that unit's next phase. If Air Orders is acquired during the enemy phase, it will disappear when the next player phase begins.
- Any 【Bonus】 on a unit lasts until the start of that unit's next phase. If
- Warping counts as the unit's move for the turn. The unit can still perform an attack, an Assist, or a structure destruction after warping.
- Warping is unaffected by movement preventing effects, Divine Vein effects,
Stall, 
Gravity, 
Traverse Terrain, and 【Pathfinder】. - Warping can be obstructed by warp preventing effects unless the warping unit has a Pass effect, or warps using a camp, a fortress, or sigils.
- Warping is unaffected by movement preventing effects, Divine Vein effects,
- The stat increase that can be applied by Def/Res Oath 4 is considered a temporary buff.
List of owners
| Unit | Skill chain | |||
|---|---|---|---|---|
 | Def/Res Oath 1 5  | Def/Res Oath 2 5 | Def/Res Oath 3 5 | – |
 | Def/Res Oath 1 5 | Def/Res Oath 2 5 | Def/Res Oath 3 5 | Def/Res Pledge 5 |
 | Def/Res Oath 1 5 | Def/Res Oath 2 5 | Def/Res Oath 3 5 | Def/Res Oath 4 5 |
* 
Alfonse: Prince of Askr, 
Sharena: Princess of Askr, 
Anna: Commander, and 
Forma units cannot be used for skill inheritance or turned into combat manuals.
**
Rearmed and 
Attuned Heroes cannot be used for normal skill inheritance or turned into combat manuals after using their Arcane/Elite Inheritance unless their Arcane/Elite Inheritance is restored via merges.
Alfonse: Prince of Askr, Sharena: Princess of Askr, Anna: Commander, and Forma units cannot be used for skill inheritance or turned into combat manuals.**
Rearmed and Attuned Heroes cannot be used for normal skill inheritance or turned into combat manuals after using their Arcane/Elite Inheritance unless their Arcane/Elite Inheritance is restored via merges.Availability
Summoning events
| Start | End | Event | Skill |
|---|---|---|---|
| 2020-01-01 | 2020-02-01 | Renewed Spirit | Def/Res Oath 3 |
| 2020-02-02 | 2020-03-01 | Special Hero Summon (Year 3) | Def/Res Oath 3 |
| 2020-06-11 | 2020-06-25 | Focus: Double Special Heroes | Def/Res Oath 3 |
| 2021-01-01 | 2021-02-01 | New Year: ω Special Heroes | Def/Res Oath 3 |
| 2022-01-01 | 2022-02-01 | Revival: ω Special Heroes | Def/Res Oath 3 |
| 2023-01-04 | 2023-01-14 | Renewed Spirit | Def/Res Oath 3 |
| 2023-04-11 | 2023-04-20 | Focus: New Power | Def/Res Oath 3 |
| 2024-01-01 | 2024-02-01 | New Year: ω Special Heroes 2 | Def/Res Oath 3 |
| 2024-03-15 | 2024-04-05 | Attuned Caeda & Ascended Merric | Def/Res Oath 3 |
| 2024-05-08 | 2024-06-07 | New Heroes & Rearmed Lumera | Def/Res Oath 4 |
| 2024-06-28 | 2024-07-12 | Emblem Celica: Of Echoes | Def/Res Oath 3 |
| 2024-08-30 | 2024-09-13 | Legendary Heroes - Shez | Def/Res Oath 4 |
| 2024-09-09 | 2024-10-04 | Legendary & Mythic Hero Remix 2 | Def/Res Oath 3 |
| 2024-10-11 | 2024-10-25 | Ascendant, Rearmed & Attuned | Def/Res Oath 3 |
| 2024-11-26 | 2024-12-08 | Focus: Heroes with Special Spiral | Def/Res Oath 4 |
| 2025-01-03 | 2025-01-13 | Renewed Spirit (4★SHSR) | Def/Res Oath 3 |
| 2025-01-25 | 2025-02-02 | Revival: Rearmed Lumera & More | Def/Res Oath 4 |
| 2025-03-11 | 2025-03-25 | Legendary & Mythic Hero Remix 1 | Def/Res Oath 4 |
| 2025-04-20 | 2025-05-06 | 35th Anniv.: Rising Heroes Summon 2 | Def/Res Oath 3 |
Distributed units
- This skill is not available on any distributed units.
Combat Manuals
| Start | End | Hero | Currency |
|---|---|---|---|
| 2025-03-06T05:00:00Z | Caeda: Marth's Faithful | Divine Code: Part 6 |
Seal acquired from
Tempest Trials reward
- Tempest Trials+: Friends Now? ( – ): 20,000 Score.
Sacred Seal Forge
Def/Res Oath 1: Cannot be created.
Def/Res Oath 2: Enhance for 60 
Great Transparent Badge, 200 
Transparent Badge, 50 
Sacred Coin.- Def/Res Oath 3: Enhance for 400 Great Transparent Badge, 1000 Transparent Badge, 100 Sacred Coin.
In other languages
| Language | Name |
|---|---|
| English (US) | Def/Res Oath |
| Japanese | 守備魔防の信義 |
| German | Ver./Res.-Eid |
| Spanish (Europe) | Lealtad Def/Res |
| Spanish (Latin America) | Pacto Def./Res. |
| French | Vœu Déf/Rés |
| Italian | Lealtà Dif/Res |
| Traditional Chinese (Taiwan) | 防守魔防的信義 |
| Portuguese | Pacto Def./Res. |