I tried a PvP duel on my new warlock dwarf against a champion, I was 6 he was 5 and he won in no time, even with two health pots and everything I died and he took only half damage at best. I thought he was hacking, that was ridiculous. I looked into it and found the skill set of Champions to be perfect for overcoming Warlocks quickly. With skills to super-buff attack damage, and electrocute to disable spells, not to mention a skill to pull enemies into melee range are all great tools for destroying warlocks, and since duels happen in such close proximity, it is difficult for a warlock to try to use distance as an advantage, especially since the Champion can just run up and accept the duel, or decline if they cannot run up to the Warlock pre-duel. Just saying, this seems kind of crazy, I find it interesting and I do expect some patches to nerf, unnerf, nerf, and so on the new classes.