Benefit: Whenever you kill or knock unconscious an opponent with a melee attack, you gain temporary hit points equal to your Constitution bonus (minimum 1) until your next turn. These temporary hit points do not stack. You do not gain this bonus if the opponent is helpless or has less than half your Hit Dice.
Pathfinder Roleplaying Game Advanced Race Guide © 2012, Paizo Publishing, LLC; Authors: Dennis Baker, Jesse Benner, Benjamin Bruck, Jason Bulmahn, Adam Daigle, Jim Groves, Tim Hitchcock, Hal MacLean, Jason Nelson, Stephen Radney-MacFarland, Owen K.C. Stephens, Todd Stewart, and Russ Taylor.