| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| C | 
|
Infantry Flash 1 | 60 | — | Infantry allies within 2 spaces gain: "If unit's Spd ≥ foe's Spd+5, grants Special cooldown charge +1 per unit's attack. (Only highest value applied. Does not stack.)" |
 | Infantry Flash 2 | 120 | Infantry Flash 1 | Infantry allies within 2 spaces gain: "If unit's Spd ≥ foe's Spd+3, grants Special cooldown charge +1 per unit's attack. (Only highest value applied. Does not stack.)" | |
 | Infantry Flash 3 | 240 | Infantry Flash 2 | Infantry allies within 2 spaces gain: "If unit's Spd > foe's Spd, grants Special cooldown charge +1 per unit's attack. (Only highest value applied. Does not stack.)" | |
Cannot use:    | |||||
Notes
- Grants the effect of
Flashing Blade 3 to 
Infantry allies within 2 spaces.
- Only attacks performed by the user have the "Special cooldown charge +X" effect. This is true regardless of who initiated combat.
- The "Special cooldown charge +X" effect will stack with the "Special cooldown charge -X" effect.
- For example, if a unit is affected by both
Guard and 
Special Cooldown Charge +1, the effects will stack and the cooldown will go down without penalty or bonus. - The effects will only stack when the user attacks and the cooldown will go down without penalty or bonus.
- The "Special cooldown charge -X" effect will only take place when the foe attacks.
- For example, if a unit is affected by both
- If used alongside another source of "Special cooldown charge +X", only the higher of the two charge increases will apply.
- This means that if a unit has two "Special cooldown charge +1" effects from two different sources, the battle will play out as if only one "Special cooldown charge +1" effect is active.
- Skills such as
Tempo Echo and 
Arcane Þrima will neutralize effects that grant "Special cooldown charge +X" to the foe. - The Special cooldown charge effect of Infantry Flash will not apply to the user's allies if the user is inflicted with
Time's Grip, the user's allies are inflicted with 
Feud, or the user's allies are in combat against a foe with skills such as 
Impenetrable Void and 
C Feud 3.
List of owners
| Unit | Skill chain | ||
|---|---|---|---|
 | Infantry Flash 1 4  | Infantry Flash 2 4 | Infantry Flash 3 5  |
 | Infantry Flash 1 4 | Infantry Flash 2 4 | Infantry Flash 3 5 |
 | Infantry Flash 1 5 | Infantry Flash 2 5 | Infantry Flash 3 5 |
 | Infantry Flash 1 4 | Infantry Flash 2 4 | Infantry Flash 3 4 |
Availability
Summoning events
| Start | End | Event | Skill |
|---|---|---|---|
| 2018-08-28 | 2018-09-04 | Legendary Heroes - Marth | Infantry Flash 3 |
| 2018-12-28 | 2019-01-08 | Legendary Heroes - Azura | Infantry Flash 3 |
| 2019-04-27 | 2019-05-07 | Legendary Heroes - Alm | Infantry Flash 3 |
| 2019-07-31 | 2019-08-07 | Mythic Heroes - Sothis | Infantry Flash 3 |
| 2019-11-28 | 2019-12-05 | Mythic Heroes - Altina | Infantry Flash 3 |
| 2020-04-30 | 2020-05-07 | Legendary Heroes - Edelgard | Infantry Flash 3 |
| 2020-10-30 | 2020-11-06 | Legendary Heroes - Dimitri | Infantry Flash 3 |
| 2021-03-30 | 2021-04-06 | Mythic Heroes - Dagr | Infantry Flash 3 |
| 2021-09-07 | 2021-10-07 | Scions of Twelve | Infantry Flash 3 |
| 2021-11-13 | 2021-11-20 | Legendary Hero Remix | Infantry Flash 3 |
| 2022-02-02 | 2022-03-02 | Special Hero Summon (Year 5) | Infantry Flash 3 |
| 2022-04-12 | 2022-04-26 | Focus: Double Special Heroes | Infantry Flash 3 |
| 2022-05-14 | 2022-05-28 | Legendary & Mythic Hero Remix | Infantry Flash 3 |
| 2022-09-14 | 2022-09-24 | Scions of Twelve | Infantry Flash 3 |
| 2023-01-14 | 2023-01-28 | Legendary & Mythic Hero Remix | Infantry Flash 3 |
| 2023-03-13 | 2023-03-27 | Legendary & Mythic Hero Remix 2 | Infantry Flash 3 |
| 2023-09-18 | 2023-09-28 | Scions of Twelve | Infantry Flash 3 |
| 2023-11-13 | 2023-12-06 | Legendary & Mythic Hero Remix 2 | Infantry Flash 3 |
| 2024-06-20 | 2024-07-11 | Focus: Hall of Forms | Infantry Flash 3 |
| 2024-08-12 | 2024-08-26 | Legendary & Mythic Hero Remix 2 | Infantry Flash 3 |
| 2024-09-20 | 2024-09-30 | Scions of Twelve | Infantry Flash 3 |
| 2025-04-15 | 2025-05-06 | 35th Anniv.: Guaranteed Leg. Hero | Infantry Flash 3 |
| 2025-05-11 | 2025-06-08 | Focus: Legendary Revival 4 | Infantry Flash 3 |
| 2025-09-19 | 2025-09-29 | Scions of Twelve (4★SHSR) | Infantry Flash 3 |
| 2025-10-12 | 2025-11-09 | Focus: Legendary Revival 4 | Infantry Flash 3 |
| 2026-02-11 | 2026-02-15 | Scions of Twelve (4★SHSR) | Infantry Flash 3 |
| 2026-03-14 | 2026-03-29 | Focus: Hall of Forms Revival | Infantry Flash 3 |
Distributed units
- Tempest Trials+: Past King, Future Queen 5 (×1)
- Tempest Trials+: Past King, Future Queen 5 (×1)
- Tempest Trials+: The Prince's Secret (×1)
- Tempest Trials+: The Prince's Secret (×1)
- Use Heroic Grails (×20)
- Use Heroic Grails (×20)
- Resplendent Hero (×1)
Combat Manuals
| Start | End | Hero | Currency |
|---|---|---|---|
| 2022-03-07T09:00:00Z | Lewyn: Wind-Song Scion | Divine Code: Part 3 | |
| 2023-08-07T03:00:00Z | 2023-09-28T06:59:59Z | Effie: Dedicated Heart | Divine Code: Ephemera 8 |
| 2025-05-07T07:00:00Z | 2025-06-28T06:59:59Z | Noire: Demurely Deft | Divine Code: Ephemera 5 |
In other languages
| Language | Name |
|---|---|
| Japanese | 歩行の柔撃 |
| German | Infanterieblitz |
| Spanish (Europe) | Acelerón inf. |
| Spanish (Latin America) | Acelerón inf. |
| French | Élan infanterie |
| Italian | Scatto fanteria |
| Traditional Chinese (Taiwan) | 步行之柔擊 |
| Portuguese | Infantaria veloz |