This is just a reminder that when Sir Terry Pratchett was knighted, he dug up his own iron ore, learned to smelt, smelted it, added meteorite iron, learned to forge, and forged himself a starmetal sword. As you do.
And then he put it away somewhere safe so he wouldn't violate any UK knife laws.
If I ever run a post-apocalyptic campaign, Sir Terry Pratchett's Starmetal
Sword will definitely be a legendary item for players to retrieve.