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From The Vault - Fallout Wiki
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Fallout 4
RequirementsPerception 7
Level 1, 11, 21, 35, and 42
EffectsUp to +50 Energy resistance
base id000ca99d (level 1)

000ca99e (level 2)

000ca99f (level 3)

00065e4b (level 4)

00065e4c (level 5)
Fallout 76
EffectsIncreased Energy resistance
base id00000000

The Refractor perk improves your resistance to energy damage.

Fallout 4 loading screen hints

Refractor is a perk in Fallout 4 and Fallout 76.


With each rank of this perk, your Energy resistance increased by 10. Therefore, the fifth and final rank result in an Energy resistance of 50.