Do you understand the weight of that implication? A complete overhaul could potentially be the equivalent of designing a new class. Are you sure you're not fine with just a few changes here and there? Anyway it's a controversial matter obviously. From a PvP perspective I think we need either something to get us out of roots or preferably Death's Advance baseline (possibly without the on-use speed increase). Frost might require a few more changes in order to make it fun I suppose. I just hate the fact that DK's feel so fragile in PvP right now without any good defesnives. I don't mean to insult PvE players but wouldn't a simple damage increase make everything fine for you in raiding? In addition to that I also think our talent tree could use some minor changes here and there. And on a selfish note I wish the AoE grip nerf would be reverted.
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No the CD would be way too long in PvP.
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We never had massive burst, we had consistent damage (which we still do as UH) but as you said we don't have the survivability nor mobility to utilize it.