I can well imagine you having trouble with just cold. My sorc was a Tri-Elementalist with Frozen Orb as primary attack (augmented it with static field, thunderstorm and meteor from the other energy types) and I had enough troubles with some cold-immunes! *sighs*

Good luck, Sniper!

Well, level 52 isn't that bad actually. Stay a bit longer in Act V Nightmare and gain levels (With players x you should be pretty quick about it) I would advise to go for firewall: For one thing I'd never again take meteor! While it might do more damage, as you have to wait for quite a few seconds before it actually strikes after having cast it, it's pretty useless! :p Moreover firewall only has two prereqs giving you quite a few points to place in there if you go up till level 60 or better even 65.

Or maybe static field. It doesn't have any prereqs at all. And you only need a couple of points for it to get some range. Even if you can't actually kill anything with it, it helps to reduce hitpoints somewhat so your merc can finish them off easily. It's what I used on most cold immunes like zombies - but it won't help you much against uniques like Duriel. Duriel will probably kill your merc off with one swipe and then with just static field and cold spells you're in a tough spot against the cold immune boss.
Lira Lindriel - - - - - - - Magic is real - unless defined integer.

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