| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| A | 
|
Fortress Def 1 | 40 | — | Grants Def+3. Inflicts Atk-3. |
|
Fortress Def 2 | 80 | Fortress Def 1 | Grants Def+4. Inflicts Atk-3. | |
|
Fortress Def 3 | 160 | Fortress Def 2 | Grants Def+5. Inflicts Atk-3. | |
| No restrictions. | |||||
Available as a Sacred Seal.
List of owners[ | ]
| Unit | Skill chain | |||
|---|---|---|---|---|
 | Fortress Def 1 5  | Fort. Def/Res 1 5 | Fort. Def/Res 2 5 | Fortifications 5 |
 | Fortress Def 1 3  | Fortress Def 2 3 | Fortress Def 3 4  | – |
 | Fortress Def 1 5 | Fort. Def/Res 1 5 | Fort. Def/Res 2 5 | Fort. Def/Res 3 5 |
 | Fortress Def 1 4 | Fortress Def 2 4 | Fortress Def 3 4 | – |
 | Fortress Def 1 5 | Fort. Def/Res 1 5 | Fort. Def/Res 2 5 | Fort. Def/Res 3 5 |
 | Fortress Def 1 5 | Fort. Def/Res 1 5 | Fort. Def/Res 2 5 | Fort. Def/Res 3 5 |
 | Fortress Def 1 3 | Fortress Def 2 4 | Fortress Def 3 5 | – |
 | Fortress Def 1 4 | Fort. Def/Res 1 4 | Fort. Def/Res 2 4 | – |
 | Fortress Def 1 3 | Fortress Def 2 3 | Fortress Def 3 4 | – |
Availability[ | ]
Summoning events
| Start | End | Event | Skill |
|---|---|---|---|
| 2017-04-14 | 2017-04-26 | New Heroes: World of Shadows | Fortress Def 3 |
| 2017-07-06 | 2017-07-13 | Focus: Alm and Celica's Battle | Fortress Def 3 |
| 2017-08-15 | 2017-08-31 | New Heroes: The Sacred World | Fortress Def 3 |
| 2017-09-07 | 2017-09-13 | Focus: Ephraim and Eirika's Battle | Fortress Def 3 |
| 2018-10-23 | 2018-11-09 | Brave Redux | Fortress Def 1 |
| 2018-12-23 | 2019-01-06 | Focus: Heroes with Fortress skills | Fortress Def 3 |
| 2019-01-30 | 2019-02-06 | Legendary Heroes - Duma | Fortress Def 1 |
| 2019-02-03 | 2019-02-04 | Focus: Alm and Celica's Battle | Fortress Def 3 |
| 2019-02-13 | 2019-02-23 | Focus: New Power 1 | Fortress Def 3 |
| 2019-03-08 | 2019-04-10 | New Heroes: Beyond Darkness | Fortress Def 1 |
| 2019-04-21 | 2019-05-04 | Focus: Tempest Trials | Fortress Def 1 |
| 2019-05-14 | 2019-05-26 | Focus: New Power | Fortress Def 3 |
| 2019-08-22 | 2019-08-23 | Focus: Heroes with Fortress skills | Fortress Def 3 |
| 2019-09-18 | 2019-09-26 | Focus: Heroes with Bonfire | Fortress Def 1 |
| 2019-10-07 | 2019-10-15 | Focus: Heroes with Hone/Fortify | Fortress Def 1 |
| 2020-01-04 | 2020-01-12 | Focus: Fae and Idunn's Battle | Fortress Def 1 |
| 2020-01-22 | 2020-02-01 | Focus: Heroes with Chill Skills | Fortress Def 1 |
| 2020-02-02 | 2020-02-03 | Focus: Alm & Celica's Battle | Fortress Def 3 |
| 2020-02-04 | 2020-02-05 | Focus: Ephraim and Eirika's Battle | Fortress Def 3 |
| 2020-03-06 | 2020-03-31 | New Heroes: Harmony amid Chaos | Fortress Def 3 |
| 2020-03-17 | 2020-03-30 | Focus: Tempest Trials | Fortress Def 1 |
| 2020-06-13 | 2020-06-14 | Focus: Heroes with Bonfire | Fortress Def 1 |
| 2020-06-20 | 2020-06-26 | Focus: Heroes w/Vengeful Fighter | Fortress Def 1 |
| 2020-08-11 | 2020-08-19 | Focus: Forsyth & Python's Battle | Fortress Def 3 |
| 2020-09-18 | 2020-10-08 | New Heroes: Despair and Hope | Fortress Def 1 |
| 2020-11-08 | 2020-11-16 | Revival: Harmony amid Chaos | Fortress Def 3 |
| 2020-11-12 | 2020-11-13 | Focus: Heroes with Chill Skills | Fortress Def 1 |
| 2020-12-21 | 2020-12-28 | Focus: Heroes with Chill Skills | Fortress Def 1 |
| 2020-12-25 | 2021-01-04 | Legendary Heroes - Lilina | Fortress Def 1 |
| 2021-03-01 | 2021-03-08 | Focus: Heroes with Moonbow | Fortress Def 1 |
| 2021-05-03 | 2021-05-11 | Focus: With Resonance: Shields | Fortress Def 1 |
| 2021-06-08 | 2021-06-09 | Focus: Heroes with Chill Skills | Fortress Def 1 |
| 2021-07-31 | 2021-08-10 | Focus: Heroes with Fortress Skills | Fortress Def 1 |
| 2021-10-20 | 2021-10-21 | Focus: Heroes w/Vengeful Fighter | Fortress Def 1 |
| 2021-10-29 | 2021-10-30 | Focus: Heroes with Chill Skills | Fortress Def 1 |
| 2021-11-10 | 2021-11-16 | Focus: New Power | Fortress Def 1 |
| 2021-11-28 | 2021-12-05 | Focus: Weekly Revival 40 | Fortress Def 1 |
| 2021-12-30 | 2022-01-08 | Focus: Shinon & Gatrie's Battle | Fortress Def 1 |
| 2022-02-13 | 2022-02-20 | Focus: Weekly Revival 42 | Fortress Def 1 |
| 2022-03-26 | 2022-04-02 | Focus: Guinivere & Melady | Fortress Def 1 |
| 2022-04-24 | 2022-05-01 | Focus: Weekly Revival 47 | Fortress Def 1 |
| 2022-04-30 | 2022-05-10 | Focus: Chivalric Struggle 1 | Fortress Def 3 |
| 2022-05-13 | 2022-05-19 | Focus: New Power | Fortress Def 1 |
| 2022-06-15 | 2022-06-19 | Three Hopes Release Event 8 | Fortress Def 3 |
| 2022-06-23 | 2022-06-29 | Focus: Heroes with Moonbow | Fortress Def 1 |
| 2022-08-03 | 2022-08-04 | Focus: Heroes with Moonbow | Fortress Def 1 |
| 2022-08-29 | 2022-09-10 | Focus: Heroes with Bonfire | Fortress Def 1 |
| 2022-10-30 | 2022-11-06 | Focus: Weekly Revival 40 | Fortress Def 1 |
| 2022-11-27 | 2022-12-04 | Focus: Weekly Revival 42 | Fortress Def 1 |
| 2023-01-15 | 2023-01-22 | Focus: Weekly Revival 47 | Fortress Def 1 |
| 2023-08-13 | 2023-08-20 | Focus: Weekly Revival 74 | Fortress Def 1 |
| 2023-09-24 | 2023-10-01 | Focus: Weekly Revival 40 | Fortress Def 1 |
| 2023-10-08 | 2023-10-15 | Focus: Weekly Revival 42 | Fortress Def 1 |
| 2023-11-12 | 2023-11-19 | Focus: Weekly Revival 47 | Fortress Def 1 |
| 2024-01-12 | 2024-01-17 | Focus: New Power | Fortress Def 3 |
| 2024-05-19 | 2024-05-26 | Focus: Weekly Revival 74 | Fortress Def 1 |
| 2024-06-02 | 2024-06-09 | Focus: Weekly Revival 47 | Fortress Def 1 |
| 2024-08-09 | 2024-08-20 | Focus: New Power | Fortress Def 1 |
| 2024-08-16 | 2024-09-17 | New Heroes: In Those We Hope | Fortress Def 1 |
Distributed units
- Tempest Trials+: Life & Death 3 (×1)
- Tempest Trials+: Life & Death 3 (×1)
- Tempest Trials: Invisible Ties (×1)
- Tempest Trials: Invisible Ties (×1)
- Use Heroic Grails (×20)
- Use Heroic Grails (×20)
- Resplendent Hero (×1)
- Resplendent Hero (×1)
- Three Heroes quest (October 2019) (×1)
- Three Heroes quest (October 2022) (×1)
Combat Manuals
| Start | End | Hero | Currency |
|---|---|---|---|
| 2020-03-05T05:00:00Z | Kliff: Curious Spirit | Divine Code: Part 1 | |
| 2020-11-05T03:00:00Z | 2020-12-28T06:59:59Z | Ferdinand: Noblest of Nobles | Divine Code: Ephemera 11 |
| 2021-02-04T03:00:00Z | 2021-03-28T06:59:59Z | Seth: Silver Knight | Divine Code: Ephemera 2 |
| 2021-03-04T03:00:00Z | Gatrie: Armored Amour | Divine Code: Part 2 | |
| 2023-03-06T03:00:00Z | 2023-04-28T06:59:59Z | Mordecai: Gentle Firetender | Divine Code: Ephemera 3 |
| 2024-01-09T03:00:00Z | 2024-02-28T06:59:59Z | Ferdinand: Noblest of Nobles | Divine Code: Ephemera 1 |
| 2024-08-06T05:00:00Z | 2024-09-28T06:59:59Z | Seth: Silver Knight | Divine Code: Ephemera 8 |
Seal acquired from[ | ]
Tempest Trials reward[ | ]
- Tempest Trials+: Thunder's Fist ( – ): 10,000 Score.
Sacred Seal Forge[ | ]
Fortress Def 1: Create for 20 Great Verdant Badge, 100 Verdant Badge, 20 Sacred Coin.- Fortress Def 2: Enhance for 60 Great Verdant Badge, 200 Verdant Badge, 50 Sacred Coin.
- Fortress Def 3: Enhance for 400 Great Verdant Badge, 1000 Verdant Badge, 100 Sacred Coin.
In other languages[ | ]
| Language | Name |
|---|---|
| Japanese | 守備の城塞 |
| German | Abwehrfestung |
| Spanish (Europe) | Bastión Def |
| Spanish (Latin America) | Bastión Def. |
| French | Forteresse |
| Italian | Forte difensivo |
| Traditional Chinese (Taiwan) | 防守堡壘 |
| Portuguese | Fortaleza Def. |