Funny thing about this build was that I rarely used Molten Shell before reaching Chaos. While leveling I focused on keeping Ice Nova with cold to fire, increased area of effect, and Shock Nova linked. The idea being to debuff lightning resist -40% after Ice Nova, and then Shock Nova to debuff cold -20% and fire -20%. I mainly used Lightning Strike and Molten Shell on uniques and champion melee packs. The champion ranged monsters were usually lined up in a semi-circle for Novas. Avoided elemental reflect uniques until my lightning resist and "+X life gained after hitting enemy with attacks" could keep me topped off.
Tried Chaos at 58 (before able to use 1k hp chest) and was basically stun fodder for any monsters able to hit me. The Nova rotation that carried me through the entire game comfortably was now eating all my mana and hardly damaging the mobs. After reconsidering my options, I just ditched the novas and went all out on Molten Shell and Tempest Shield. Lightning Strike (make sure to add cold damage from support or equipment...but not fire since that would not prep the mobs for -40% fire resist on Molten Shell) started pulling its weight once I traded for an almost perfect hybrid 1-hander.
Make sure to get a nice granite flask for the champion goatmen.
Respec notes for level 60:
3 regrets - Soul Siphon (+25 mana for killing enemy) is amazing during the early levels, especially if you don't like spamming flasks. Moved points for 30% weapon elemental damage and 10 strength to equip chest.
6 regrets - Arcing Blows (+20% chance to shock on hit with lightning damage, +65% shock duration) works well up until Chaos with a 17% Shock Nova for ~48% chance to shock using Elemental Weakness curse. Reallocated points down to Blast Radius to boost Molten Shell.
5 regrets - Inner Force (+30% increased effects of buffs you cast) gave 3% block chance from Tempest Shield and about 120 armor from Molten Shell at level 60. Terrible, but I tried it. Used the points for 12% AoE radius and 10 strength needed to equip Kaom's Heart.