hollow shell
What I have in mind is that the katanas wear out, meaning that over time they do almost no damage. So, you would need to have your own blacksmith to order katanas from and have them delivered to you. However, if you have the rank of Pillar, you could go to the village of blacksmiths yourself through the Hidden (who, according to the anime, are the ones who take you there) and be able to explore it and buy better katanas. In summary, the katanas wear out, you have your own blacksmith for your katanas, and with the rank of Pillar, you can visit the village of blacksmiths at your leisure (maybe you will have to go to the Ubayashiki mansion for the Hidden to take you there).
rich canopy