Supposedly the group battle is easier, but I've never found that to be true.
I would suggest cheating like a cheating cheater, if you're on PC: enable the console and enter runscript zz_dae_debug, then clear your party and add anyone you want. (You can even fill your party and add Anders on top -- but you won't be able to control him.)
Failing that, my suggestion is micromanage, micromanage, micromanage. Have Aveline tank anything truly annoying. Or, you know, everything. Pause often to make sure she's using Taunt whenever possible. If you can, have Anders (and Varric, if he's got the Rain Of Arrows ability) lay down AoEs whenever possible.
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I would suggest cheating like a cheating cheater, if you're on PC: enable the console and enter runscript zz_dae_debug, then clear your party and add anyone you want. (You can even fill your party and add Anders on top -- but you won't be able to control him.)
Failing that, my suggestion is micromanage, micromanage, micromanage. Have Aveline tank anything truly annoying. Or, you know, everything. Pause often to make sure she's using Taunt whenever possible. If you can, have Anders (and Varric, if he's got the Rain Of Arrows ability) lay down AoEs whenever possible.