| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| A | 
|
Fire Boost 1 | 50 | — | At start of combat, if unit's HP ≥ foe's HP+3, grants Atk+2 during combat. |
 | Fire Boost 2 | 100 | Fire Boost 1 | At start of combat, if unit's HP ≥ foe's HP+3, grants Atk+4 during combat. | |
 | Fire Boost 3 | 200 | Fire Boost 2 | At start of combat, if unit's HP ≥ foe's HP+3, grants Atk+6 during combat. | |
| No restrictions. | |||||
Available as a Sacred Seal.
Notes
- The stat boost that can be applied during combat by Fire Boost is considered a temporary buff.
- Fire Boost compares current HP between units to apply the Combat Buff.
List of owners
| Unit | Skill chain | |||
|---|---|---|---|---|
 | Fire Boost 1 4  | Fire Boost 2 4 | Fire Boost 3 4 | – |
 | Fire Boost 1 4 | Fire Boost 2 4 | Fire Boost 3 5  | – |
 | Fire Boost 1 4 | Fire Boost 2 4 | Fire Boost 3 5 | – |
 | Fire Boost 1 4 | Fire Boost 2 4 | Fire Boost 3 5 | – |
 | Fire Boost 1 4  SR | Fire Boost 2 4 SR | Fire Boost 3 4 SR | – |
 | Fire Boost 1 3  | Fire Boost 2 3 | Fire Boost 3 4 | – |
 | Fire Boost 1 3 | Fire Boost 2 3 | Fire Boost 3 4 | – |
 | Fire Boost 1 4 SR | Fire Boost 2 4 SR | Fire Boost 3 4 SR | – |
 | Fire Boost 1 5 | Fire Boost 2 5 | Fire Boost 3 5 | Earthfire Boost 3 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 |
|---|---|---|---|
| 2017-06-14 | 2017-06-30 | New Heroes: Echoes of Mystery | Fire Boost 3 |
| 2017-07-28 | 2017-08-31 | Nohrian Summer | Fire Boost 3 |
| 2018-01-31 | 2018-02-05 | Legendary Heroes: Ike | Fire Boost 3 |
| 2018-06-25 | 2018-07-25 | Nohrian Summer | Fire Boost 3 |
| 2019-02-02 | 2019-02-09 | Special Hero Summon (Year 1) | Fire Boost 3 |
| 2019-07-15 | 2019-07-27 | Focus: New Power | Fire Boost 3 |
| 2019-08-03 | 2019-09-03 | Nohrian Summer | Fire Boost 3 |
| 2019-09-01 | 2019-09-08 | Focus: Weekly Revival 13 | Fire Boost 3 |
| 2020-01-19 | 2020-01-26 | Focus: Weekly Revival 13 | Fire Boost 3 |
| 2020-06-07 | 2020-06-14 | Focus: Weekly Revival 13 | Fire Boost 3 |
| 2020-06-18 | 2020-07-02 | Call of the Sea - Special Hero Gift | Fire Boost 3 |
| 2020-06-27 | 2020-07-07 | Focus: Father-Complex Fray | Fire Boost 3 |
| 2020-07-29 | 2020-08-12 | Nohrian Summer | Fire Boost 3 |
| 2020-08-07 | 2020-09-07 | Pirate's Pride | Fire Boost 3 |
| 2021-01-10 | 2021-01-17 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2021-02-02 | 2021-03-01 | Special Hero Summon (Year 4) | Fire Boost 3 |
| 2021-02-20 | 2021-03-06 | Focus: Double Special Heroes | Fire Boost 3 |
| 2021-07-26 | 2021-08-09 | Nohrian Summer | Fire Boost 3 |
| 2021-08-12 | 2021-08-26 | Pirate's Pride | Fire Boost 3 |
| 2021-08-29 | 2021-09-05 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2022-05-29 | 2022-06-05 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2022-07-29 | 2022-08-08 | Nohrian Summer (4★SHSR) | Fire Boost 3 |
| 2022-08-26 | 2022-09-05 | Pirate's Pride | Fire Boost 3 |
| 2022-10-23 | 2022-10-30 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2023-06-04 | 2023-06-11 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2023-07-12 | 2023-07-21 | Focus: New Power | Fire Boost 3 |
| 2023-08-01 | 2023-08-11 | Nohrian Summer (4★SHSR) | Fire Boost 3 |
| 2023-08-21 | 2023-08-31 | Pirate's Pride | Fire Boost 3 |
| 2024-06-23 | 2024-06-30 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2024-07-29 | 2024-08-05 | Nohrian Summer (4★SHSR) | Fire Boost 3 |
| 2024-08-29 | 2024-09-07 | Focus: Ross & Ewan's Battle | Fire Boost 3 |
| 2024-09-03 | 2024-09-13 | Pirate's Pride (4★SHSR) | Fire Boost 3 |
| 2024-11-15 | 2024-12-06 | Rearmed Þjazi & Rearmed Lilina | Fire Boost 3 |
| 2025-03-28 | 2025-04-15 | Emblem Eirika: Of the Sacred | Fire Boost 3 |
| 2025-04-18 | 2025-04-19 | 35th Anniversary: Daily Revival 24 | Fire Boost 3 |
| 2025-06-08 | 2025-06-15 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2025-07-13 | 2025-07-27 | Legendary & Mythic Hero Remix 1 | Fire Boost 3 |
| 2025-07-28 | 2025-08-07 | Nohrian Summer | Fire Boost 3 |
| 2025-09-02 | 2025-09-12 | Pirate's Pride (4★SHSR) | Fire Boost 3 |
| 2025-09-13 | 2025-09-27 | New Heroes Return | Fire Boost 3 |
| 2025-11-16 | 2025-11-23 | Focus: Muscles Don't Betray 1 | Fire Boost 3 |
| 2025-12-28 | 2026-01-05 | Revival: Rea. Þjazi & Rea. Lilina | Fire Boost 3 |
| 2026-01-24 | 2026-02-07 | New Heroes Return | Fire Boost 3 |
| 2026-02-09 | 2026-02-13 | Nohrian Summer (4★SHSR) | Fire Boost 3 |
| 2026-02-10 | 2026-02-14 | Pirate's Pride (4★SHSR) | Fire Boost 3 |
| 2026-03-13 | 2026-03-27 | New Heroes Return | Fire Boost 3 |
| 2026-06-07 | 2026-06-14 | Focus: Weekly Revival 24 | Fire Boost 3 |
| 2026-06-07 | 2026-06-12 | Revival: Rea. Þjazi & Rea. Lilina | Fire Boost 3 |
Distributed units
- Tempest Trials+: Breadwinners (×1)
- Tempest Trials+: Breadwinners (×1)
- Tempest Trials: Breath of Destiny (×1)
- Tempest Trials: Breath of Destiny (×1)
- Panette: Classy Brawler (×1)
- Panette: Classy Brawler (×2)
- Tempest Trials+: Sandy Struggle (×1)
- Tempest Trials+: Sandy Struggle (×1)
- Use Heroic Grails (×20)
- Use Heroic Grails (×20)
- Use Heroic Grails (×20)
- Use Heroic Grails (×20)
- Grand Hero Battles quest (August 2025) (×1)
Combat Manuals
| Start | End | Hero | Currency |
|---|---|---|---|
| 2020-12-08T07:00:00Z | 2021-01-28T06:59:59Z | Ross: His Father's Son | Divine Code: Ephemera 12 |
| 2022-04-06T03:00:00Z | 2022-05-28T06:59:59Z | Ross: His Father's Son | Divine Code: Ephemera 4 |
| 2022-08-08T03:00:00Z | 2022-09-28T06:59:59Z | Geese: A Life at Sea | Divine Code: Ephemera 8 |
| 2022-10-05T03:00:00Z | 2022-11-28T06:59:59Z | Boyd: Future Great | Divine Code: Ephemera 10 |
| 2024-10-03T05:00:00Z | 2024-11-28T06:59:59Z | Ross: His Father's Son | Divine Code: Ephemera 10 |
| 2025-03-06T05:00:00Z | Þjazi: Ruthless Jötun | Divine Code: Part 6 |
Seal acquired from
Tempest Trials reward
- Tempest Trials+: Heating Things Up ( – ): 6,000 Score.
Sacred Seal Forge
Fire Boost 1: Create for 20 
Great Scarlet Badge, 100 
Scarlet Badge, 20 
Sacred Coin.
Fire Boost 2: Enhance for 60 Great Scarlet Badge, 200 Scarlet Badge, 50 Sacred Coin.
Fire Boost 3: Enhance for 400 Great Scarlet Badge, 1000 Scarlet Badge, 100 Sacred Coin.
In other languages
| Language | Name |
|---|---|
| Japanese | 生命の業火 |
| German | Feuerschub |
| Spanish (Europe) | Pirovitalidad |
| Spanish (Latin America) | Pirovitalidad |
| French | Boost ardent |
| Italian | Impulso fuoco |
| Traditional Chinese (Taiwan) | 生命業火 |
| Portuguese | Pirovital |