Mutant Massacrer/Fallout: New Vegas

Mutant Massacrer is a challenge perk in Fallout: New Vegas.

Effects
Your savvy at mutant killing grants you a damage bonus to killing them. With the first rank (50 kills), you get 3% bonus to damage against super mutants and nightkin; the second rank (100 kills) provides a 6% bonus, and the final rank (150 kills) confers a 10% bonus.