This guide is updated to MXL 2017 except the uber section since i didnt do uber with full potential yet using this build. the easy uber can be done using this build with mid game gear.
If its Immune to cold, just use skill shower of rock or hire act 5 merc to deal a lot of physical damage. Using the early game gear, I'm pretty sure u have enough damage output to kill cold immune monster using shower of rock.
Yes but If u find really difficult to kill immune to cold monster at later game, u can craft barb helm to get ancient hand oskill. Its a melee skill same as stormblast but dealing fire damage instead.