
The prefix of a legendary-type armors dropped by Legendary Enemies determine its bonus effects. See the list below for the prefix's effects.
| Almost Unbreakable | Quadruples durability (Power Armor only). |
| Assassin's | Reduces damage from humans by 15%. |
| Bolstering | Grants increasing energy and damage resistance the lower your Health (up to +35). |
| Cavalier's | Reduces damage while blocking or sprinting by 15%. |
| Chameleon | Enemies have a harder time detecting you while you're sneaking and not moving. |
| Cunning | +1 Agility and +1 Perception |
| Duelist's | 10% chance to disarm melee attacker on hit. |
| Exterminator's | Reduces damage from Mirelurks and bugs by 15%. |
| Fortifying | +1 Strength and +1 Endurance |
| Freefall | Prevents falling damage.(Needs to be present on both equipped leg armors) |
| Ghoul slayer's | Reduces damage from Ghouls by 15%. |
| Hunter's | Reduces damage from animals by 15%. |
| Low Weight | Low carry weight. |
| Lucky | +2 Luck. |
| Martyr's | Temporarily slows time down during Combat when you are at 20% or less Health. |
| Mutant Slayer's | Reduces damage from Super Mutants by 15%. |
| Piezonucleic Lining | Radiation exposure increases Action Point refresh speed. |
| Poisoner's | +25 poison resistance. |
| Powered | Increases Action Point refresh speed. |
| Punishing | Reflects 10% of melee damage back on attacker. |
| Safecracker's | Increases size of sweet spot while picking locks. |
| Sharp | +1 Charisma and +1 Intelligence. |
| Sprinter's | Increases movement speed by 10%. |
| Titan's / Sentinel's | Reduces damage while standing and not moving by 15%. |
| Troubleshooter's | Reduces damage from robots by 15%. |
| VATS Enhanced | 10% reduction in Action Point cost in V.A.T.S. |
Source: Fallout Wikia