Harlowe is a former Maliwan combat scientist, driven by the need to understand how things work. While this initially made her an outcast amongst her Traunt relatives, Harlowe has used her intellect to bring new tech and gadgetry to the battlefield as a Vault Hunter. Harlowe's brilliance is apparent in everything she does, but so is her enthusiasm and love for life. Harlowe brings everything to the fight, including her sunny disposition. Always ready to give a beat down, her spirit can't be beat.
Using her collection of clever contraptions, Harlowe has a huge impact whether she's crowd-controlling enemies with Cryo and Radiation damage or enhancing her allies' survivability. Her CHROMA Accelerator unleashes an Unstable Energy Pocket of Cryo damage that chills anything in its wake, she can isolate priority targets by suspending them in a Stasis bubble created by her HALO Accelerator, and she can buff allies and freeze enemies using her area-of-effect Flux Generator.
VAULT HUNTER BASICS
Three distinct Action Skills are available to each Vault Hunter, but only one can be equipped at a time. Note that some items in the skill tree (Augments and Capstones) must be equipped into your loadout to gain their effects.
Every Vault Hunter has three skill trees, each stemming from an Action Skill. You'll need to invest five of the Skill Points you get from leveling up into a given row to unlock access to the next row. Once you've invested 15 total Skill Points into a skill tree, you'll have access to three Branches for that skill tree; at the bottom of those Branches is a powerful Capstone (more on those in a moment).
Augments are enhancements that provide secondary bonuses to your Action Skills. In most cases, only one Augment is equippable at a time.
Capstones are powerful enhancements that modify or override specific Action Skill functionalities. A Capstone can be found at the bottom of each branch of a Vault Hunter's Skill Tree. Only one Capstone is equippable at a time.
You can use Action Skills from other skill trees even if you haven't invested any points into them, but you won't be able to equip the powerful Augments or Capstones from one skill tree onto the Action Skill of a different skill tree. Committing Skill Points to the skill tree that will properly synergize with your favorite Action Skill is key!
Note that all skill names, descriptions, and numbers listed below are subject to change; Vault Hunters aren't exactly known for being predictable.
Harlowe Abilities Breakdown
Gravitar Vault Hunter Trait
Entanglement
Whenever Harlowe uses her Action Skill on enemies, those enemies become Entangled.
Entangled: Entangled enemies share a portion of Gun Damage and Skill Damage with all other Entangled enemies.
Gravitar Action Skills

CHROMA Accelerator
(Creative Bursts skill tree)
Fire an Unstable Energy Pocket from Harlowe's CHROMA Accelerator. The Unstable Energy Pocket passes through enemies and deals Cryo Damage to all enemies it passes near. Pressing Action Skill causes the Unstable Energy Pocket to explode and deal heavy Radiation Damage in a large area.
Gravitar Skill Trees
CREATIVE BURSTS



Cyclotron
5 points
Harlowe gains increased Fire Rate.

PPE
5 points
Harlowe gains increased Maximum Shield Capacity and Shield Recharge Rate.

Field-Ready Prototype
5 points
Harlowe gains increased Action Skill Damage.

Bleeding Edge
5 points
Harlowe gains increased Reload Speed.

Voidstar
Whenever Harlowe's Unstable Energy Pocket passes by an enemy, it loses a portion of its current Total Health and becomes Frozen.

Neutron Capture
All Damage Harlowe's Unstable Energy Pocket deals to enemies is stored. Whenever it explodes, a portion of that Stored Damage is transferred to Harlowe's Gun, causing her to deal Bonus Radiation Damage.

Elementary
5 points
Harlowe gains increased Elemental Damage and Status Effect Damage.

Test Subjects
5 points
Whenever Harlowe applies a Status Effect to an enemy, she gains increased Action Skill Cooldown Rate.

Get Up and Go
5 points
Whenever Harlowe activates or retriggers an Action Skill, she gains increased Movement Speed.

Elephant's Foot
1 point
Whenever Harlowe's Shield breaks, she deals Radiation Damage to all Entangled enemies. Harlowe gains Overshield equal to the amount of Damage dealt this way.

Great Red DoT
3 points
Harlowe gains increased Status Effect Duration.

Enriched
3 points
Harlowe gains increased Radiation Damage.
BRANCH 1

Practical Applications
5 points
Harlowe gains increased Skill Damage.

Field Research
Whenever Harlowe kills an enemy with her Unstable Energy Pocket and when she kills an Entangled enemy while her Unstable Energy Pocket is active, refund a portion of her next Action Skill Cooldown.

Carry the One
5 points
Whenever Harlowe Entangles an enemy, she gains a chance to Entangle another nearby enemy.

Core Sample
5 points
Harlowe gains Lifesteal against Frozen enemies. If she's at full Health, she gains Overshield instead.

Break the Ice
1 point
Convert all CHROMA Accelerator Damage to Cryo Damage.

Opposing Force
3 points
Whenever Harlowe Freezes an enemy, she gains increased Action Skill Cooldown rate.
This effect can stack.

Q-Ball
Harlowe's Unstable Energy Pocket bounces as it travels and can no longer be manually detonated. Each time it bounces, it creates a Radiation Explosion. Whenever it strikes an enemy, it changes direction and bounces towards another enemy.

Cold Welding
Whenever Harlowe Freezes an Entangled enemy, it deals Cryo Damage to itself and all other Entangled enemies.
BRANCH 2

Poisoned Sun
5 points
Harlowe gains increased Radiation Damage and Irradiation Chance.

Special Purpose Magnets
Harlowe's Unstable Energy Pocket pulls enemies along as it passes by, and its detonation deals increased Damage for every enemy it has already hit.

Glow Up
5 points
Harlowe gains Critical Hit Chance with Guns against Irradiated enemies.

Fissile Launcher
3 points
Whenever Harlowe damages an Irradiated enemy or an Entangled enemy, shoot a Radiation Dart at another enemy.

Chain Reactor
3 points
Harlowe deals Bonus Radiation Damage to Entangled enemies.

Wasted
1 point
Kill Skill. Killing an Irradiated enemy or killing an enemy with Radiation Damage leaves behind a Radiation Hazard.

Demon Core
As Harlowe's Unstable Energy Pocket travels, it shoots Radiation Darts at enemies. Whenever Harlowe Entangles an enemy while her Action Skill is active, automatically Irradiate that enemy.

Dirty Bomb
1 point
Whenever Harlowe Irradiates an enemy, create a Radiation Explosion on that enemy.
BRANCH 3

Highly Efficient
5 points
Kill Skill. Whenever Harlowe kills an enemy with a Skill, Restore a portion of her Shield Capacity.

Containment Breach
Whenever Harlowe's Unstable Energy Pocket detonates, it Splits into several smaller, fast moving Unstable Energy Pockets.

Mechanical Brilliance
5 points
Whenever Harlowe damages an enemy with a Skill, she gains increased Skill Damage.
This effect can stack.

Eureka!
1 point
Whenever Harlowe enters Fight For Your Life, she throws a free Unstable Energy Pocket at a nearby enemy - if there are any.

Rounding Up
5 points
For every enemy her Action Skill damages, Harlowe gains increased Gun Damage when her Action Skill ends.
This effect can stack.

Alternative Fuel Source
5 points
Whenever Harlowe activates CHROMA Accelerator, drain her Shield and Amp her next Unstable Energy Pocket.

The Shattering Light
Charge Skill. CHROMA Accelerator gains Charges as Harlowe keeps it readied for the Duration of CHROMA Accelerator or until all Charges are used. Holding the Action Skill ends The Shattering Light early and refunds a portion of the Cooldown for every Charge remaining.
Press Action Skill: Fire a fast-moving Unstable Energy Pocket, consuming a Charge.

QED
1 point
Melee Override. Harlowe attaches an Unstable Energy Pocket to her fist, and slams it into an enemy in front of her.