Vayshan
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Playing on a computer. Haven't tried it online yet. Maybe it's just the computer playing so well... It's clear that the developers taught it the most effective tactics. I was a fairly well-leveled Warlock, and my Ice Bolt dealt 600 damage. But its Chaos magic weakening + Rage reduced the damage to almost zero. I even managed to kill a Cyclops (playing on Veteran difficulty). I didn't have much luck with the guild, though. But I don't think Earthquake would have helped much.