| Name | Cooldown | Description | SP | Required |
|---|---|---|---|---|
| Lethality | 4 | When Special triggers, treats foe's Def/Res as if reduced by 75% during combat. Disables non-Special skills that "reduce damage by X%." | 500 | Luna |
Cannot use:                    
| ||||
Notes[ | ]
- Lethality will neutralize non-Special "reduces damage by X%" effects from Specials such as
Vital Astra.
- Lethality will not neutralize Special "reduces damage by X%" effects such as Gust or Laguz Friend 4.
- For more information, see Damage calculation.
- Lethality will not neutralize Special "reduces damage by X%" effects such as
List of owners[ | ]
| Unit | Skill chain | ||
|---|---|---|---|
 | New Moon 5  | Luna 5 | Lethality 5 |
 | New Moon 5 | Luna 5 | Lethality 5 |
 | New Moon 5 | Luna 5 | Lethality 5 |
 | New Moon 5 | Luna 5 | Lethality 5 |
 | New Moon 5 | Luna 5 | Lethality 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.In other languages[ | ]
| Language | Name |
|---|---|
| Japanese | 滅殺 |
| German | Exitus |
| Spanish (Europe) | Letalidad |
| Spanish (Latin America) | Letalidad |
| French | Meurtrier |
| Italian | Flagello |
| Traditional Chinese (Taiwan) | 滅殺 |
| Portuguese | Letalidade |