I've seen this ability before, cant remember what it is. But I've seen it on Saryn and now Dante. In the onslaught, the map was enveloped in some sort of energy, animated clouds of energy all around like it was a wall, and the enemies died fast, like nuke mirage fast. 760 something kills in one round of corpus. may not be one ability to achieve this. I figure its a helminth ability with augment but I'm having trouble trying to research this.