As a blizz sorc, I farm bosses (andy, meph, diablo, Baal) and then I also do trav and Ancient Tunnels.
She can do Key farming as well, though a hammerdin with Enigma is a lot faster.
The best answer is farm what you enjoy farming. The game gets monotonous once you have the ability to farm pretty much anything so change it up depending on how you feel at the time. I run a summon necro for pits/cows, a hammerdin for keys and Chaos, a blizz sorc for tunnels/andy/meph/diablo/Baal, and a javzon for eldritch/shenk/pindle. The characters can handle other areas too, but these are the areas that they do best at with my builds. As long as you are farming a boss with a decent drop table or a lvl 85 area, you're good. Beyond that its all personal preference.
Pits is (are?) The Pits in A1 Tamoe Highland. Take Outer Cloister Wp, and go back through the monastery. Follow the road. It will fork. One fork takes you to Black Marsh, the other right to the Pit. Level 85 area. It's nice.
The only ones you can't kill with cold are the wave 2 skeletons which are fairly weak by themselves. So either have your merc take those out or have an off-spec skill (i.e. not cold) to handle them.
I have blizz sorc mainly for Key runs. Cold immune Nila is annoying, but thats why I have Vikhyat with EthCryptic Axe RW Insight, Treachery (lazy to swap Fortitude from my other melee hero) and he can clear everything (Teleport micro needed).
But basicly I can clear entire game p1 easily. Even did few p6 Baal run as only source of dmg (was like slow walk rather then run ).
As someone mentioned hammerdin with Enigma. Yeah its better. But at what cost Jah+Ber vs 3 Ist.
My sorc gear is full tall rasha with 35% Spirit to get 105% FCR and +mana rings (not sure if I need 650mana).
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LF Ral, Nef, keys, pame, pruby, jewel
My light sorc runs the 3 keys, Andy, Meph, Pindle and Shenk.
My cold sorc runs 2 keys (don't want to waste the time on Nihlathak), Andy, Meph and cows.
My other characters who can't Teleport (no Enigma yet) pretty much just run Diablo, and those who can handle gloams do Baal as well. Plus cows sometimes on my trapsin and necro.
I kinda want to add Trav to my runs, but most of my chars can't do it easily (my casters struggle with the immunes, and my melee struggle with the damage..)
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Akoto
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