Priority Numero Uno for the many heroines of this world who were part of his old harem. Get married. Priority Numero far away and used as an excuse for Priority Numero Uno, Stop War.
Unfortunately for them, this guy is unlikely to be able to craft Romantic Interest to any of them. Certainly at least not for a few more dozen chapters. But I'm always open to being wrong about these predictions.
And I should've called it. It eluded me, but I should have noticed that of course he would also be able to Craft a harem member.
I mean. Swords becoming Waifus you can have Seggs with already exists, this was the obvious logical step in his use of crafting skills.
Said manga laying the groundwork for doing it with swords:
https://mangadex.org/title/e86f3c88...i-no-maken-niyoru-maken-no-tame-no-harem-life
But yeah, unfortunately for all the heroines, the MC will continue being unable to craft sexual interest, craft babies or craft seggs. But hey, they're welcome to join the new harem and blame his brother for messing the flow of the old harem.
Also, why freeze when you think about the Hero of the Empire, a clear love rival. You should be accelerating. None of these characters have brains.
And inb4 the holy weapon he crafts on his own is the most legendary of legendary fantasy weapon to ever exist. A gun. A gun with a busty mommy spirit. Or maybe we'll get a weird twist and the gun will be the only loli in the harem.