| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| B | 
|
Flow Guard 1 | 60 | — | At the start of combat, if unit's HP = 100% and unit initiates combat, neutralizes effects that prevent unit's follow-up attacks and inflicts Special cooldown charge -1 on foe per attack during combat. (Only highest value applied. Does not stack.) |
 | Flow Guard 2 | 120 | Flow Guard 1 | At the start of combat, if unit's HP ≥ 50% and unit initiates combat, neutralizes effects that prevent unit's follow-up attacks and inflicts Special cooldown charge -1 on foe per attack during combat. (Only highest value applied. Does not stack.) | |
 | Flow Guard 3 | 240 | Flow Guard 2 | If unit initiates combat, neutralizes effects that prevent unit's follow-up attacks and inflicts Special cooldown charge -1 on foe per attack during combat. (Only highest value applied. Does not stack.) | |
 | Flow Guard 4 | 300 | Flow Guard 3 | If unit initiates combat, inflicts Spd/Def-4 on foe, neutralizes effects that guarantee foe's follow-up attacks and effects that prevent unit's follow-up attacks, and inflicts Special cooldown charge -1 on foe per attack during combat (only highest value applied; does not stack), and also, if foe's attack can trigger foe's Special, inflicts Special cooldown count+1 on foe before foe's first attack during combat (cannot exceed foe's maximum Special cooldown). | |
Cannot use:                        | |||||
Effects
| Effects | Targets | Conditions |
|---|---|---|
 Flow Guard 3 | ||
| Combat effects | ||
 Neutralizes "Cannot follow-up" |  Unit | Player Phase |
 Special cooldown charge -1 |  Foe | |
 Flow Guard 4 | ||
| Combat effects | ||
 Spd/Def-4 | Foe | Player Phase |
 Neutralizes "Guaranteed follow-up" | ||
| Neutralizes "Cannot follow-up" | Unit | |
| Special cooldown charge -1 | Foe | |
 Special cooldown count+1before Foe's first attack | Player Phase & Foe has anoffensive special | |
Notes
- "If unit initiates combat" means if the user starts combat during the player phase. The unit does not need to deal damage, nor be the first to attack.
- However, if the effect is applied after combat, the unit must also survive it to fulfill this condition.
- Flow Guard will not neutralize the additional follow-up of Potent Follow effects.
- Follow-up effects that are neutralized by Flow Guard:
- Effects that grant the foe a guaranteed follow-up such as
Quick Riposte 4, 
Guaranteed follow-ups during combat, or the Grand Conquests 
Cavalry area effect. - Effects active on the unit that prevent their follow-up attacks, such as
Windsweep 3, 
Watersweep 3, or 
Weaving Fighter. - Effects active on the foe that prevent the unit's follow-up attacks such as
Steady Impact, 
Vengeful Fighter 4, or 
Foe Cannot Follow-Up.
- Effects that grant the foe a guaranteed follow-up such as
- 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.
- 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 reductions 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 inflict "Special cooldown charge -X" on its user. - The stat reduction that can be applied during combat by Flow Guard 4 is considered a temporary debuff.
- Flow Guard 4's Special cooldown count increase that occurs during combat is a flat +1 and is not affected by effects related to Special cooldown charge such as Guard, Special Cooldown Charge +1, and Tempo Echo.
- All flat cooldown count increases and/or reductions during combat will stack with each other if they trigger at the same time.
- For example, if a unit has
Preempt Pulse and 
Hush Spectrum, the effects will stack and the unit's cooldown count will neither increase nor decrease.
- For example, if a unit has
- All flat cooldown count increases and/or reductions during combat will stack with each other if they trigger at the same time.
List of owners
| Unit | Skill chain | |||
|---|---|---|---|---|
 | Flow Guard 1 4  SR | Flow Guard 2 4 SR | Flow Guard 3 4 SR | – |
 | Flow Guard 1 5  | Flow Guard 2 5 | Flow Guard 3 5 | Flow Guard 4 5 |
 | Flow Guard 1 4 SR | Flow Guard 2 4 SR | Flow Guard 3 4 SR | – |
 | Flow Guard 1 5 | Flow Guard 2 5 | Flow Guard 3 5 | Flow Guard 4 5 |
 | Flow Guard 1 5 | Flow Guard 2 5 | Flow Guard 3 5 | – |
Availability
Summoning events
| Start | End | Event | Skill |
|---|---|---|---|
| 2021-11-30 | 2021-12-14 | Legendary Eitri & Mythic Thórr | Flow Guard 3 |
| 2022-03-22 | 2022-03-31 | Focus: AHR 2022 Top Four | Flow Guard 3 |
| 2022-04-28 | 2022-05-12 | Mythic Heroes - Medeus | Flow Guard 3 |
| 2022-08-31 | 2022-09-14 | Legendary Heroes - Deirdre | Flow Guard 3 |
| 2022-12-16 | 2023-01-16 | Holiday Handoff | Flow Guard 3 |
| 2023-02-02 | 2023-03-02 | Special Hero Summon | Flow Guard 3 |
| 2023-02-28 | 2023-03-14 | Legendary Heroes - Robin | Flow Guard 3 |
| 2023-04-13 | 2023-04-27 | Focus: Double Special Heroes | Flow Guard 3 |
| 2023-06-08 | 2023-06-11 | New Heroes & Mythic Heiðr | Flow Guard 3 |
| 2023-07-28 | 2023-08-11 | Mythic Heroes - Freyr | Flow Guard 3 |
| 2023-09-22 | 2023-10-05 | 1,000 Heroes! ω Special Heroes | Flow Guard 3 |
| 2023-09-28 | 2023-10-12 | Legendary Heroes - Elincia | Flow Guard 3 |
| 2023-12-30 | 2024-01-09 | Holiday Handoff | Flow Guard 3 |
| 2024-01-17 | 2024-02-03 | Focus: Heroes with Luna | Flow Guard 3 |
| 2024-01-30 | 2024-02-20 | Emblem Marth & Mythic Lumera | Flow Guard 3 |
| 2024-04-30 | 2024-05-14 | Mythic Heroes - Loki | Flow Guard 3 |
| 2024-05-20 | 2024-06-20 | Brides to Be | Flow Guard 4 |
| 2024-06-16 | 2024-06-20 | Revival: Mythic Heiðr & More | Flow Guard 3 |
| 2024-09-17 | 2024-10-04 | Aided Reginn & Attuned Timerra | Flow Guard 4 |
| 2024-11-11 | 2024-11-25 | Legendary & Mythic Hero Remix 1 | Flow Guard 3 |
| 2024-11-22 | 2024-12-22 | Focus: Double Special Heroes | Flow Guard 4 |
| 2024-12-24 | 2025-01-03 | Holiday Handoff | Flow Guard 3 |
| 2024-12-25 | 2025-01-17 | Emblem Lyn: Of Blazing | Flow Guard 4 |
| 2025-01-15 | 2025-01-30 | Focus: Heroes with Luna | Flow Guard 3 |
| 2025-02-02 | 2025-03-07 | Special Hero Summon | Flow Guard 4 |
| 2025-02-15 | 2025-02-25 | 8th Anniv. "12 Luminaries" 2 | Flow Guard 4 |
| 2025-03-21 | 2025-04-04 | New Heroes Return | Flow Guard 4 |
| 2025-05-12 | 2025-05-26 | Legendary & Mythic Hero Remix 1 | Flow Guard 4 |
| 2025-05-18 | 2025-05-28 | Brides to Be | Flow Guard 4 |
| 2025-05-24 | 2025-06-01 | Revival: Aid. Reginn & Att. Timerra | Flow Guard 4 |
| 2025-07-13 | 2025-07-27 | Legendary & Mythic Hero Remix 1 | Flow Guard 3 |
| 2025-08-10 | 2025-08-13 | Focus: Heroes with Luna | Flow Guard 3 |
| 2025-09-13 | 2025-09-27 | New Heroes Return | Flow Guard 4 |
| 2025-11-24 | 2025-12-19 | New Heroes Return | Flow Guard 4 |
| 2025-12-17 | 2025-12-27 | Holiday Handoff | Flow Guard 3 |
| 2025-12-19 | 2026-01-09 | Focus: Hall of Forms | Flow Guard 3 |
| 2026-02-14 | 2026-02-18 | Holiday Handoff (4★SHSR) | Flow Guard 3 |
| 2026-03-13 | 2026-03-27 | New Heroes Return | Flow Guard 4 |
| 2026-05-20 | 2026-06-10 | Focus: Hall of Forms | Flow Guard 3 |
| 2026-05-23 | 2026-05-31 | Brides to Be | Flow Guard 4 |
| 2026-05-31 | 2026-06-07 | Focus: Weekly Revival 126 | Flow Guard 3 |
| 2026-06-05 | 2026-06-10 | Revival: Aid. Reginn & Att. Timerra | Flow Guard 4 |
Distributed units
- This skill is not available on any distributed units.
Combat Manuals
| Start | End | Hero | Currency |
|---|---|---|---|
| 2025-03-06T05:00:00Z | Lapis: Mighty Bride | Divine Code: Part 6 |
In other languages
| Language | Name |
|---|---|
| Japanese | 怒涛・キャンセル |
| German | Erschwernis |
| Spanish (Europe) | Anula corriente |
| Spanish (Latin America) | Anula corriente |
| French | Flots négation |
| Italian | Ritarda |
| Traditional Chinese (Taiwan) | 怒濤・取消 |
| Portuguese | Guarda onda |