I can't seem to find their crafting recipes anywhere. I tried going to the forge at Inazuma City, but no one is selling or offering it. I figured it might have something to do with the City Reputation system, but it's not available in the list of rewards. I checked the Divine Sakura tree and that's not listed as a reward either, granted I can't see that far up the list.
So now I'm curious -- where do I get the blueprints for these weapons? As far as I remember the blueprints for craftable Liyue and Mondstadt weapons were there from the start, but it seems my Forge does not have those blueprints at all which I assume you have to unlock.