DA is broken this build to not cleave off frags, but if it works like Helya they're irretrievable.
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I do think these two pulled a pretty key problem with momentum to the front though - on certain fights, you just can't do it. That's okay for a dungeon, but not so much for a raid.
Within 8 yards of the tank on Star Augar? Cya. Don't have mobility for Shatter / Fel Nova? Pain-train. Which means if you mess up the cancelling even once you're dead, and all because you have to dash around like a crazed fool. It's a skill-bar, sure.. but the other talents *need* to be competitive if that's gonna be the case.
Krosus is even worse, because you lag a little and you fly off the edge and instantly die. And you can't really strafe because you'll strafe into tank mechanics / aoe mechanics.