LEGENDARY EFFECTS

★ 1-STAR (22)

Adrenal+10 Damage and Energy Resistance per kill while on a Kill Streak (Max 10).
From “Adrenal” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Aristocrat'sReflect incoming damage based on caps held.
Assassin's-15% Damage from Humans
Auto StimAutomatically use a Stimpak when Hit While Health is 25% or less, once every 60 seconds
BolsteringGrants up to 10% Damage Reduction at lower Health Percent.
ChameleonBecome Invisible While Sneaking and Not Moving
CloakingBeing Hit in Melee causes the Player to become Invisible Once Every 30 Seconds
Exterminator's-15% Damage from Mirelurks and Insects
Ghoul Slayer's-15% Damage from Ghouls
HeavyweightGrants up to 10% Damage Reduction at Higher Encumberance.
Hunter's-15% Damage From Animals
Life SavingAutomatically Revive Yourself with a Stimpak. Cooldown 5 minutes, reduced by 60 seconds per additional Life Saving mod
LucidIncreases Damage Reduction up to +6% as you Fill Your Feral Meter.
Mutant Slayer's-15% Damage from Super Mutants
Mutant'sUp to 5% Damage Reduction as you acquire more Mutations.
Nocturnal+4 PER and AGI while CloakedResistances Night +4
From “Nocturnal” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Overeater'sIncreases Max Health up to +40 as you Fill Your Hunger and Thirst Meters.
Regenerating+0.5% Heal RateHeal Rate +0.5
From “Regenerating” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Troubleshooter's-15% Damage from Robots
UnyieldingGain up to +3 to All S.P.E.C.I.A.L. Stats (except END) when Health is Low.
Vanguard'sGrants up to 6% Damage Reduction as Health Increases.
Zealot's-15% Damage from Scorched

★★ 2-STAR (19)

Agility+2 AgilityAgility +2
From “Agility (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Antiseptic+25% Reduced Disease Chance From Environmental HazardsSURV Disease Chance Mult Environmental Hazard +25
From “Antiseptic (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Charisma+2 CharismaCharisma +2
From “Charisma (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Cryologist'sCryo Resistance +50
ElementalistIncrease All Resistances by 5
From “Elementalist” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Endurance+2 EnduranceEndurance +2
From “Endurance (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
FierceFortify Limb Resistance based on Kill Streak count.
From “Fierce” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
GluttonHunger and Thirst Grow 10% Slower. Currently disabled, Human mod only.
HardyReceive 7% Less Explosion Damage
HazMat+25 Radiation ResistanceRadiation Resistance +50
From “HazMat” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Intelligence+2 IntelligenceIntelligence +2
From “Intelligence (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Luck+2 LuckLuck +2
From “Luck (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Pain KillerGain Health over time while on a Kill Streak. Effect becomes stronger the higher the Kill Streak.
From “Pain Killer” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Perception+2 PerceptionPerception +2
From “Perception (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Poisoner's+25 Poison ResistancePoison Resistance +50
From “Poisoner's (Fallout 76)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Powered+5% Action Point RegenAction Points Rate +5
From “Powered (Fallout 76)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Pyro-Technician'sFire Resistance +50
RushingGain Action Points over time while on a Kill Streak. Effect becomes stronger the higher the Kill Streak.
From “Rushing (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Strength+2 StrengthStrength +2
From “Strength (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).

★★★ 3-STAR (22)

Acrobat's-50% Fall DamageFalling Damage Mod -0.5
From “Acrobat's (Fallout 76)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
ActiveMax AP increased by +20
From “Active” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
AdamantiumReceive 15% less Limb DamageLimb Damage Resistance +15
From “Adamantium (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Arms Keeper'sWeapon Weights Reduced by 20%Legendary Armor Weight Weapons Value +20
From “Arms Keeper's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
BeltedAmmo Weight Reduced by 20%Legendary Armor Weight Ammo Value +20
From “Belted” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Burning5% Chance to deal 19 Fire Damage per second for 3 seconds to Melee Attackers.Legendary Armor Burning Count +1
From “Burning (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Cavalier's10% Damage Reduction while sprinting.
Defender's-15% Damage Taken While BlockingAuto Block Chance +5
From “Defender's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Dissipating+0.25% Radiation Damage RecoveryRads Rate +100
From “Dissipating” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Diver's+3 HP Per Second
Doctor's+5% Effectiveness of Stimpaks, RadAway, and Rad-X
DurabilityBreaks 50% Slower
Electrified5% Chance to deal 18 Energy Damage per second for 3 seconds to Melee Attackers.Legendary Armor Electrified Count +1
From “Electrified (Fallout 76 Legendary Mod)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Frozen5% Chance to deal 12 Cryo Damage per second for 4 seconds to Melee Attackers.Legendary Armor Frozen Count +1
From “Frozen” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
HealthyMax HP increased by +20
From “Healthy” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Pack Rat'sJunk Item Weights Reduced by 20%Legendary Armor Weight Junk Value +20
From “Pack Rat's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Reflex2% EvadeEvade Chance +2
From “Reflex” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Safecracker's+1 Lockpicking Skill +1 Hacking SkillLockpicking Tier +1 · Hacking Tier +1
From “Safecracker's (Fallout 76)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Secret Agent's+25% Less Noise While Sneaking · +25% Reduce Detection ChanceSneak +25 · Sneak Sound +25
From “Secret Agent's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Sentinel's5% Damage Reduction while standing still.
Thru-hiker'sFood, Drink, and Chem Weights Reduced by 20%Legendary Armor Weight Food Drink Chems Value +20
From “Thru-hiker's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Toxic5% Chance to deal 12 Poison Damage per second for 7 seconds to Melee Attackers.Legendary Armor Toxic Count +1
From “Toxic” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).

★★★★ 4-STAR (11)

Battle-Loader's15% Chance to Instantly Reload When Bashing Enemies (up to 75% Chance on Full Stack)
From “Battle-Loader's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Bruiser'sMelee Weapons Deal +5% Bonus Damage (up to +25% on Full Stack)
From “Bruiser's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Hauler'sIncreases Carrying Capacity by 30.
From “Hauler's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Limit-BreakingEach Worn Armor Piece Reduces the Cost of Critical Hits by -10% (up to -50% on Full Stack)
From “Limit-Breaking” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Miasma's+10 Poison Damage per Second to Nearby Targets.Acid Cloak +10
From “Miasma's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
RagingUpon being hit, deal +3% Damage for 10 seconds.
From “Raging” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Ranger'sRanged Weapons Deal +5% Bonus Damage (up to +25% on Full Stack)
From “Ranger's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
Runner'sSprinting Action Point Cost Reduced by -20% (up to -100% on Full Stack)
From “Runner's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
SawbonesHealth Regenerates Slowly (+1 Health per second) (up to +5 Health per second on Full Stack)
Tanky's+200 Damage Resist for 10s When Standing Still (20s Cooldown) (up to +1000 on Full Stack)Legendary Tankys Power Armor Count +1
From “Tanky's” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).
VectorGain 10% Bonus VATS Accuracy Against Distant Targets
From “Vector (Fallout 76)” on The Fallout Wiki, CC BY-SA 4.0, adapted (formatting).

Descriptions come from the game files, with curve-table values filled in. Where the game words an effect only in its interface, the wording is from The Fallout Wiki (credited on each effect) and the exact stat changes are shown underneath.