I just took anything synergizing with cold damage and put it on Frost and it works pretty well!
Frost
- Biting Frost augment
- Arcane Ice Storm
- Freeze Force augment
- Icy Avalanche ofc
Tenet Glaxion
- Shivering Contagion
- Primary Frostbite arcane
- Photon Overcharge (still missing this one but soon I'm adding it too)
Glaxion melts everything in front of you, spreads cold like crazy which also adds ability strength and duration due to arcane ice storm, you have huge crit chance and dmg, you have excellent armor strip and can easily generate overguard.
Since no merciless on glaxion you have to run serration but if I had max rank arachne I'd maybe try that instead of arcane grace once I have photon overcharge from NW. Am I missing anything else thats fun and that could be added to the mix?
Not sure if I should go with vile acceleration on glaxion or maybe add something like hunter munitions or bladed rounds instead.
In any case, it takes a bit to set up the whole build but it feels very thematic and flexible, Frost really becomes even more of a powerhouse with it, I only ever used him for his bubble until now.
edit: I'm also thinking about what to subsume over his #2 since it seems kinda useless, it is low damage and you have plenty of cold procs even without it. Nourish might be the boring but safe option?