Did you actually play Sunsinger or Dawnblade? They both have the ability to one shot. Stormcaller Landfall can oneshot, and if you’re asking for Stormcaller’s super to oneshot normally, that would be absurd
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All warlock supers are fine for pvp. Only thing i would change is a slight damage buff for stormcaller in pve. I would also take sunsinger over dawnblade any day.