yeah that's why I tunnel warlocks and kill on sight, no matter how many people I'm fighting. Illidan is swarming with 560, 570, even up to 578 ilvl locks that can use fire and brimstone and aoe down my 15 guys if I don't grip, stun, and kill them off the second I see them. When I run into big group there's usually 3-5 of them, and they're all destro, and they all spam incinerate.
The hit hard single target too... ran into one the other night, he was probably only 555-560 ilvl and chaos bolt my warrior for 150k in defensive stance with 75% resilience. Bad choice of targets since the warrior has about 930k hp, but still, that stuff hurts.
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