Idea for a Grinding stone / sharpening stone for improvement of bladed weapons
This could be a structure built using something like Hewn boulders, Planks and Nails
My idea would perhaps allow a weapon to be increase the damage output of a weapon but at a cost of max durability so it would limit how much you could improve a weapon before making it useless.
another idea for the same structure would be around repairs on certain weapons again this could reduce the Max Durability on repair - after all you can only repair items so much before they need replacing, the amount of durability lost could be based against the skill in the required craft. so the better you are at a craft the less it would wear down on repair.