1) Shielding! Always skip. Cost too much time. Either let them be or drag them with you through endless trashmobs to kill them sometimes later on.
2) Depends on your 'weaknesses' I guess. I fight nearly every pack, at least try to do. If I think it's too much time consuming, I run. Or if the map doesn't give me enough space to dodge all affixes and effects.
Edit (after a lot of 81s/82s over the weekend):
It becomes nearly impossible to survive big packs (whites!) of the following:
- Mallet Lord
- Death Maiden
- Colossal Gorger
- Punisher (usually there are not many, but more than 2 are bad)
Those bastards just melt your gargs. Either skip the level and hope for a new monster roll on the next or skip the run completely.
Arcane depends on the map I'd say. If it's something like frost cave it's bad. Halls of Agony it's okay as long as you can dance around. If it's getting too much lazerZ I just spirit walk through to a safer spot and engage anew.
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