Thrill of the Kill

Paragon Tier
Prerequisite: 11th level, gladiator theme
Benefit: Whenever you bloody an enemy or reduce an enemy to 0 hit points, you can use a free action to expend your second wind. If you do, you do not gain the benefit of your second wind but can instead make a saving throw against an effect that a save can end.

Published in Dark Sun Campaign Setting, page(s) 115.