Spam Eternal fist off cooldown, freeze enemies with shield / gun, Insta melt target. Repeat. Prioritise targets eternal fist picks up.
Eternal Fist. Expedite.
Splash weapons to trigger Unweave the Rainbow.
Then for bosses, as they cannot be frozen we have to return to Phasecast with the after activating gain 250% gun damage anoint and just melt the boss with traditional bossing guns. Crit, Hellwalker, Free Radical etc.
Phasezerker is the no brainer here. Max uptime on action skill and rush stacks for cryo efficiency.
Skills: Doesn’t matter at all whatever you get.
Passives: Gun damage, Weapon type damage, cooldown rate, splash radius, splash damage etc.