Whats the best gear for act 2 holy freeze merc?

Helm:
Body:
Weapon:

Helm: eth vamp gaze OR eth andy's visage
Body: eth fortitude
Weapon: eth insight (ca/thresher/great poleaxe etc...)

this but treachery > forti a hundred times over on a hammerdin

your merc gets a ton of % ed from your conc aura, he needs ias rather than more % ed.

Immortal merc above gear with fort or dmg merc treachery but can die sometimes telestomping in p8 chaos

Depends what area you are running

Ignore this idiot

Forti gives you 5 times more hp vs phys attacks
+more dmg too in most cases

Go insight, gaze, forti