| Ammoro |
Just to add to this from my digging further into this (4 years later). I am looking into the staggered/stunned condition regarding Staggering Critical and Stunning Critical to see the potential benefit late game for fighting more complicated enemies. For Frigid touch, it just applies the Staggered condition automatically, which does affect constructs (Bob Bob Bob is correct on that account). To go a little deeper, Constructs have: "Immunity to any effect that requires a Fortitude save (unless the effect also works on objects, or is harmless)."
So Staggering Critical (a fort save on crits) would not affect them because it is a saving throw. Which is a shame because the staggering critical states even if they save they are still staggered for 1 round. Sounds like the end result would be the same effect as Frigid Touch, but that may just be me. Hope this helps others down the road!