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Borderlands 4

Neutron Decay Effects

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☆ How Rush Saved Mercenary Day (Bounty Pack 1)
★ 12 active SHiFT Codes as of December 4, 2025
☆ Black Market Location
★ Elemental Weakness Chart
☆ Legendary Weapons
★ Builds: Vex | Amon | Rafa | Harlowe

Neutron Decay is a Passive skill in Harlowe's Cosmic Brilliance skill tree in Borderlands 4. See the effects of Neutron Decay here.

List of Contents

Neutron Decay Effect

Skill Overview

Neutron Decay Icon Neutron Decay Vault Hunter Harlowe
Tree Cosmic Brilliance
Type Passive
Max Points 5
Effect
Whenever Harlowe Irradiates an enemy, she gains increased Gun Damage. This effect can stack.

Borderlands 4 Related Guides

Skills

List of All Skills

All Skills by Tree

Vex
The Fourth Seal Vexcalation Here Comes Trouble
Amon
Calamity Vengeance Cybernetics
Rafa
People Person Remote Agent This Year's Gimmick
Harlowe
Creative Bursts Seize the Day Cosmic Brilliance

All Harlowe Skills

Harlowe Capstones

Group StudyGroup Study Potential TransferencePotential Transference Violent HorizonViolent Horizon
Demon CoreDemon Core Q-BallQ-Ball The Shattering LightThe Shattering Light
Cold PlungeCold Plunge Falling BodiesFalling Bodies Ground StateGround State

Harlowe Augments

Blue GiantBlue Giant Coronal Mass EjectionCoronal Mass Ejection Nuclear WinterNuclear Winter
Perpetual EnginePerpetual Engine Unified TheoryUnified Theory Containment BreachContainment Breach
Field ResearchField Research Neutron CaptureNeutron Capture Special Purpose MagnetsSpecial Purpose Magnets
VoidstarVoidstar Cold StorageCold Storage InertiaInertia
Peer ReviewPeer Review Strange AttractorStrange Attractor Wildcat DestabilizationWildcat Destabilization

Harlowe Passives

Absolute ZeroAbsolute Zero AccretionAccretion Action at a DistanceAction at a Distance
AnnihilationAnnihilation Blue ShiftBlue Shift Confirmative RealityConfirmative Reality
Creative OverflowCreative Overflow Critical FundingCritical Funding DecoherenceDecoherence
Distribution FunctionDistribution Function Excited StateExcited State Exposed CoreExposed Core
Feedback LoopFeedback Loop Gamma Ray BurstGamma Ray Burst HarloweHarlowe's Certainty Principle
Heat DeathHeat Death JauntJaunt Latent ChargeLatent Charge
Mains HumMains Hum Mass FunctionMass Function MeltdownMeltdown
MomentumMomentum Neutron DecayNeutron Decay Pencils DownPencils Down
Personal ObservationPersonal Observation RefractionRefraction Resonance CascadeResonance Cascade
Runaway ReactionRunaway Reaction Alternative Fuel SourceAlternative Fuel Source Bleeding EdgeBleeding Edge
Break the IceBreak the Ice Carry the OneCarry the One Chain ReactorChain Reactor
Cold WeldingCold Welding Core SampleCore Sample CyclotronCyclotron
Dirty BombDirty Bomb ElementaryElementary ElephantElephant's Foot
EnrichedEnriched Eureka!Eureka! Field-Ready PrototypeField-Ready Prototype
Fissile LauncherFissile Launcher Get Up and GoGet Up and Go Glow UpGlow Up
Great Red DoTGreat Red DoT Highly EfficientHighly Efficient Mechanical BrillianceMechanical Brilliance
Opposing ForceOpposing Force Poisoned SunPoisoned Sun PPEPPE
Practical ApplicationsPractical Applications QEDQED Rounding UpRounding Up
Test SubjectsTest Subjects WastedWasted Bright FutureBright Future
ConcurrenceConcurrence Control GroupControl Group CryodynamicsCryodynamics
Domino EffectDomino Effect Endothermic ReactionEndothermic Reaction ExperimentationExperimentation
Flash FreezeFlash Freeze Force of WillForce of Will Freeze FrameFreeze Frame
Gordian KnotGordian Knot Heat SinkHeat Sink Indiscrete MathIndiscrete Math
Keep Ice On ThatKeep Ice On That Make ExtraordinaryMake Extraordinary Negative EntropyNegative Entropy
Parallel CircuitParallel Circuit Periodic Table FlipPeriodic Table Flip Pulse DrivePulse Drive
Quantum ImmortalityQuantum Immortality Ripple EffectRipple Effect SlingshotSlingshot
Stun LockStun Lock Sustained ReactionSustained Reaction Too Coolant For SchoolantToo Coolant For Schoolant
Triple PointTriple Point Unstable Ice-otopeUnstable Ice-otope

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Borderlands 4 Walkthrough Team
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