I made this build to utilize shadow power and rapid fire using 2 hand crossbows. What I would do with this build is Vault to an enemy, drop Caltrops, and gain 11% crit in the area +5% for Archery passive so 16% base crit not counting bonus from gear/stats. Then after that enemy is taken care of pop Shadow Power and spam Rapid Fire(runed to slow enemies playing off 20% increase in damage from Cull the Weak). I threw Impale runed for alot more single target damage. Kinda depends on how well the Rapid Fire + Shadow power does single target. I could replace it with Marked for Death with a gold rune for practically infine Rapid Fire spamming. I put multi shot with a alabaster rune to regain discipline to maintain Shadow Power.
So what do you guys think?