Those Worg Riders that appear from nowhere signiy that a drum has been activated. As soon as you kill them, another 2 or 3 will be re-summoned within about 30 secs. This makes it quite important to get to the drum pretty quickly (well unless you are using the drums to generate quick XP). There was one really tough group that was slightly above centre on the right. I think I dealt with them by going all the way to the top then coming back down the other side.
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Davros was right - just ask JD
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