I get that. Perhaps Mother Earth is preventing the Ostarians from having any technology once they've crashed. But surely they'd have metal-edged weapons available. No KA-Bar's in their possession? And if they do, those would become barter material on a planet where all other weapons are made of sticks and stones. And then there's the metal fragments of the spacecraft itself that could be valuable for fashioning weapons. I just think converting colonists from outer space into dependence on stone-age technology seems a bit unrealistic. Granted, none of this is supposed to be all that realistic anyhow.
No, I'm not trying to create an arms race in this story. But if you've got people coming from outer-space, metal is going to bleed into the weaponry of the planet. One of the first things native Americans traded for when European explorers arrived in the New World were metal weapons.
It's just something to think about when it comes to the subject of weapons in the story.
So yes, even in the middle ages, the art metallurgy and forging was readily available. But, that was out of necessity, those people could not live, fight, or survive without harnessing metal. Our Artificers and Therianths have had magic for almost a millennium now, this magic allows them to protect themselves, provide sustenance, and shelter. Though they would have knives and probably daggers (this is being updated in the section) It would not have been their primary concern to make metal weapons as they had other, more accessible means of self-defense.
Now, all this being said, the Ostarians do have a need for those weapons at least until they can master some form of magic. Hence the change, so yes there would be metal, and perhaps someone in the city or one of the Ostarians know's how to forge. If that be the case and Relikai would like to draw up the history in his character sheet then by all means we can work out a forge. But keep in mind, making a sword is a completely different animal than per say a necklace or a small knife, so there would have to be a reason why they had someone who knew how to do that on the colony ship. (not that I don't already have an idea or two
Also, I would like to make this clearer for everyone. The natives of Earth, are not primitive's or cavemen and women, they live by simpler means with lesser technology, but they are quite intelligent and resourceful. If they have made a decision as to not use something it would probably be decently reasoned, making the market for large weapons slightly smaller. In a Therianths mind I could see them asking "Why carry such a heavy piece of metal, when I can just use my claws, or teeth, or snap their necks?" Does this make sense?