Comments of chapter undefined of OLD-WORLD EXTRA

My point was different. You cannot cut through a thick object with a short weapon like a knife. There are multiple reasons - but sharpness is not the issue. The density of the material you cut, the thickness of the blade and the weight matters. Let me put it in another way - a knife that can cut will through bone will be brittle, unless the material which is made of can be durable and flexible when its thickness is few microns. The other way to do it will require extraordinary strength from the user - the knife-wielder will have to be able to push a blade through a piece of wood - after the knife is stuck (you should try it at home, take a knife and try slicing through a thick piece of wood, at some point it's stuck and it doesn't matter how sharp is the blade, the outer edges are stuck into the material and the density of the wood will require immense strength to be able to push the whole knife - slicing is entirely different thing and action, but you won't be able to slice bone with a knife as well. Knife is just too short and the physical restrictions on that are too much. There is a reason why combat knives are used for slicing and stabbing, not for cutting the target.