obsidian knives

I add an obcidian knife, as in the ancient pre-Hispanic civilizations where they were used, since they were weapons that were used before but not currently, and in this way legal problems would be avoided, and it would fit perfectly since the knives obcidian do not exist or are no longer common in real life the crafting is done with a stick and an obsidian one
putting the stick down and the obsidian up