Fallout 76 · Legendary weapon effect
Executioner's
Executioner's adds 50% more damage when the target is below 40% health, according to the supplied mod description.
How it works
Executioner's appears in the first-star legendary mod list. The stated condition is a target below 40% health, at which point the effect is +50% more damage. The source does not describe behavior at or above 40% health or define how the effect interacts with other bonuses, so those details remain outside this record.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.