Hot Blooded

"When your health drops below 50% you gain +10% more damage, but you also suffer -2 to your Agility and Perception attributes."

- Fallout: New Vegas description

Hot Blooded is a trait in the Fallout: New Vegas add-on Old World Blues.

Effect
When your health drops below 50% you deal +10% more damage, but you also suffer -2 to Perception and Agility. The actual bonus is 15%, not 10 (bug?)