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Barkskin is a perk in Fallout 3 that is rewarded at the end of the Oasis quest if the Lone Wanderer destroys Harold's heart.
The Barkskin perk will increase the player character's Damage Resistance by 5%.
The Fallout 3 Official Game Guide gives this perk's benefit as being +1 Endurance and +10% Damage Resistance. This information was based on an early build of the game, and does not reflect the final version of the perk in the released Fallout 3.