[3.0.0] Need HELP! The Coming Calamity Wander

So I'm making a build using:

Piscator's Vigil

The Coming Calamity with -
Herald of Thunder
Herald of Ice
Hypothermia
Increased Critical Strikes
Added Lightning Damage
Added Cold Damage

Thunderfist with -
Kinetic Blast
Elemental Damage with Attacks
Ice Bite
Added Cold Damage

Tree without Defences: http://poeurl.com/bqkP

I just can't think of any proper defense option!!!!!! Curse you ASSASSIN!

I could go Hybrid, change a support on Kinetic Blast or Heralds to Life Leech and take Vaal Pact while equipping the new belt: Soul Tether but then the ES on The Coming Calamity and Thunderfist are wasted and they don't have life

I could go Eva / Life but same problem as above

I could go full ES with CI but then I have nothing to regenerate it with and Vaal Pact no longer works with CI

I could just go full glass cannon freezing everything but then I will die to bosses over and over