Sinfrenzy

Every cambion carries an excessive capacity for one of the seven classical sins, determined at the moment of the cambion's birth and depending on the nature of his humanoid parent's greatest sin. Once per day for a number of rounds equal to his Hit Dice, a cambion can embrace his sin and enter a frenzied state as a free action. While a cambion is in this frenzy, his land speed increases by 10 feet and he gains a +1 bonus on Reflex saves and attack rolls.