By destroying Harold's heart deep within the damp cave, you've been exposed to his mutation and your skin is now as hard as tree bark. As a result, you've gained a permanent +5 to Damage Resistance.
- 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. The final version of this perk only gives +5 Damage Resistance.