Killer


 * The proc rate of this enhancement appears to be dependent on the CR of the monsters you kill.
 * Monsters with a CR equal to your level always proc the enhancement.
 * Monsters with a CR of one below your level seem to proc the enhancement around 50% of the time.
 * Monsters with a CR more than one level below you proc it rarely.
 * Stacks are renewed by killing more enemies; the duration for a max stack is 15 seconds.