[Nikelaos]

i would put attack, defence and movement down due to no grip on ground and so harder movement, however i wouldn't put anything else down and i don't see why they would suffer, humans would only suffer because we need oxygen to function our bodies(undead are animated by magic) and our blood pressure ,which is usually counteracted with the resistance from the air around us, would make us literally burst(no need for respiration means no need for heart which means no blood pressure)