Chance on hit to release 126% poison nova as weapon damage to all enemies within 10' radius.
At first I assumed this would be crap, but it procs constantly. Melts any mobs that get too close to me on T2 beta. Screen just fills up with poison explosions... feels like the "chance' is around 99% right now.
My strategy with it is basically, walk into the biggest mob possible and let it go off.