Hand of Vengeance

 is a perk in Fallout: New Vegas. It is acquired by completing Heartache by the Number, Rose of Sharon Cassidy's companion quest the violent way. This is done by killing off the Crimson Caravan and the Van Graffs or just simply get the evidence and hand them over to NCR so they could take care off the job.

Effects
Rose of Sharon Cassidy gains 15% more damage with Guns.