Well, being that there is no real tool for making a runestone and such and using your barehands just doesn't make sense..
a chisel should be implemented.
It could also further expand to other things you make. Such as various monuments and things you make village-related.
Perhaps a noob chisel would require the exact same or slightly more material to make it. Then a more advanced chisel would require perhaps bronze or something. All the more advanced one would do is probably go faster and for any equips it makes, make them better Q?
Just a thought. Feel free to discuss.

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