| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| C | 
|
Impenetrable Dark | 300 | — | During combat, disables skills of all foes excluding foe in combat. |
| This skill can only be equipped by its original unit. | |||||
* Unused restrictions: No restrictions.
Notes
- The neutralization effect of Impenetrable Dark only activates during combat involving the unit. It has no effect if the unit is neither the attacker nor the defender of the combat.
- Impenetrable Dark does not prevent 【Savior】 from being triggered, because 【Savior】 is not an in-combat effect.
- Effects granted to support partners during combat such as
Renewed Fang and 
Dragon Blast are also considered as ally skills and are disabled by Impenetrable Dark. - Effects granted from ally skills that are disabled by Impenetrable Dark:
- Temporary buffs from skills such as
Cross Spur Atk or Allied Sword+. - Temporary debuffs from skills such as Atk/Spd Hold or Rein Lance+.
- Bonus neutralization from skills such as Nurturing Breath or Kitty-Cat Parasol.
- Penalty neutralization from skills such as Gjallarbrú or Effulgence.
- Special cooldown charge effects from skills such as Infantry Breath 3, Respite+, or Renewed Fang.
- Special cooldown charge neutralization from skills such as Professorial Guide or Flash of Steel.
- Special cooldown count reducing effects from skills such as Fell Protection.
- Damage dealt as combat begins from skills such as Flower of Tribute.
- Damage calculation altering effects from skills such as Inf. Hexblade 3.
- Damage-reduction effects from skills such as Caduceus Staff or Domain of Ice.
- Damage-reduction neutralization effects from skills such as Dragon Blast.
- Damage-reduction reducing effects from skills such as Perspicacious
- Damage boosting effects from skills such as Domain of Flame or Fault.
- HP restoring effects from skills such as Achimenes Furl.
- Guaranteed follow-up effects from skills such as Storm of Blows.
- Follow-up preventing effects from skills such as Freikugel.
- Follow-up effect neutralization from skills such as Professorial Text or Guidance 4.
- Survival effects from skills such as Everliving Domain or Sacrifice Staff.
- Temporary buffs from skills such as
List of owners
| Unit | Skill chain | |
|---|---|---|
 | Impenetrable Dark 5  | Impenetrable Void 5 |
In other languages
| Language | Name |
|---|---|
| Japanese | 見通せぬ深き暗闇 |
| German | Tiefe Dunkelheit |
| Spanish (Europe) | Calígine total |
| Spanish (Latin America) | Calígine total |
| French | Ténèbres opaques |
| Italian | Pura oscurità |
| Traditional Chinese (Taiwan) | 無法看透的深邃黑暗 |
| Portuguese | Treva impérvia |