Obtaining the perkEdit
In order to obtain the perk, you must kill any three of the following named marked men: Blister, Beast, Bonesaw, and Blade. You should be able to obtain this easily during the Lonesome Road main quest, unless you are attempting to use stealth to get through it.
This perk gives you a bonus of +10% Damage Resistance* and +10% damage against marked men.
pc xbox360 ps3 It actually gives you +10% Damage Threshold, not Damage Resistance. [verified]