My set-up...give comments

Sounds alright. You might want ~5 into Cold Mastery, just to make sure you dump a monster's Cold Resist to -100.

hey you said i should get it to be -100 to thier cold resist...well i have had a lvl 16 cold mastery before and i still dont hurt the enimies that have cold immune...is it because i was using orb?

No mana shield. It sucks too much mana. If you have mana shield active and tele into a large pack of archers or Gloams or whatever you are basicaly toast. No more mana to tele to safety.

Cold Immunes are IMMUNE to cold. It will not effect them, no matter how much you reduce their resistances.

so should i even bother with anything into cold mastery...since they are all immune to even the cold mastery...?