Reactor is a legendary class mod for Harlowe in Borderlands 4. It is obtained randomly from any suitable loot source, but has an increased chance to drop from Primordial Guardian Inceptus located in the Vault of Inceptus.
Special Weapon Effects
Our nature is to fly. – Whenever Harlow Entangles an enemy, she gains a Reactor Stack. For every Stack, she gains +2% Movement Speed. When she gains 10 Stacks, she also gains +10% Gun Damage, Fire Rate, Reload Speed, and Status Effect Damage for 12 seconds, and loses all stacks once the Duration ends.
Stats
Skill Bonuses
Variants of the Reactor class mod will distribute 7 bonus skill points across the following skills:
- Decoherence (max. 5 points)
- Elephant's Foot (max. 1 point)
- Fissile Launcher (max. 3 points)
- Force of Will (max. 5 points)
Stat Bonuses
Includes a bonus to Status Effect Application Chance and one random stat bonus.
Trivia
- The flavor text quotes the English physicist Stephen Hawking.
Change History
- The April 30th, 2026 patch reduced the effects gained from this class mod when the player has 10 stacks from +20% to Gun Damage, Fire Rate, Reload Speed, and Status Effect Damage to +10%.
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