Marked

Marked is a perk in the Fallout: New Vegas add-on Lonesome Road.

Requirements
Kill any three of the four marked men bosses: Blister, Bonesaw, Blade or Beast.

Effects
This perk gives you a bonus of +10% Damage resistance* and +10% damage against Marked Men.

Bugs

 * It actually gives you +10% Damage Threshold, not Damage Resistance.