Nameless66

A stone weapon is unlikely to penetrate a solid metal piece of armour. You will however get an impact effect but if you get cut it will be quite nasty but a solid plate will stop that (based on comments form a metallurgist mate of mine) Both bone and stone are more likely to break against metal and less likely to penetrate so impalement is unlikely unless its ignoring armour (ie crit). Bone armour as mentioned above is hard but brittle - good against slashing, poor against impact weapons such as maces - it might protect you but can also shatter and fragment. Of course, when you get it it hurts but damage to take you out of the fight is a other thing. Against flexible armour, bone based impact weapons can certainly break bones and cause internal injury. Against flexible armour a stone weapon can certainly cut through some armour (leather / cloth) dpending on the circumstances but there is a reason why bronze tech kicked the crap out of stone / bone. Your armour and weapons were better and harder to penetrate. Think about ring mail - it minimises the metal bu with the ring spacing is hard to get through with an effective flint spear or arrow head and you've got the leather underneath to keep the sharp bit from seriously hurting you . of course, if you get the unarmuored bits that can be nasty.