How to knap:
2. rab two small rocks from the ground. Note that not all map tiles contain rocks, and that the type of rock varies depending on the geology of the area. If you already have rocks in your backpack, you can emove them, putting each in a free hand. (Alternatively, you can collect many rocks, ravel to a different area and drop them on the ground, as dropped rocks can be used as if they were in your hands if you stand on the same tile as them. However, it is necessary to go to a place having a different natural rock type, as rocks dropped in an area which contains the same type of rocks will simply disappear.)
3.Pressto open the action menu. Then press reate and select "Make sharp rock". You will be prompted to select the two rocks you shall be using. The first rock you select is the tool stone, the rock that will be sharpened, whilst the second rock is the hammerstone, which will remain unchanged after the knapping.
Once you knap a rock, your Knapper skill will increase.
The higher your Knapper skill, the more likely you are to make sharpened rocks of a higher quality.