Its only the chest piece that gives pierce resistance (almost immunity tbh) so for all you mosquito-haters, thats a pro tip.

Root Legs suposedly gives poison reststance, I am only using chest and feels like that gives some poison resistance too.. ?bugged? (Running without poison resistance potion and Im not dying to leaches and blobs though several hits taken)

I would say the "weakness to fire" is more like a fire damage x3 multiplier, would be fun to know if lets say each set piece stack this multiplier or if 1 set piece makes you take as much bonus fire damage as whole full set would.. anyone tested that?