30% hit->crit is not a lot for something you actively spend resources on (versus a passive or item buff); the expected value of the bonus crit damage from barbaric blow is still pretty mediocre, only barely above crippling strike in terms of damage potential and ignoring the other benefits to crippling strike. you get way more form the bonus pen as a situational underpen ability than trying to rely on critting.   even at 1 cost, alluded above crippling strike serves several other
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