Downtime - Adamantine Armor Crafting

I noticed on the group's previous adventure that normally everything that the creature touched was destroyed. When we came across an area where a building was still standing, it piqued my interest. The building was covered in a magical substance that strengthened it significantly. I was pleasantly surprised to find some of this substance in the room where the (ahem) now "disposed" gnome was. Members of the group identified this as adamantine ore and mentioned that it could be used to make armor. If I can infuse armor with this, I'll bet it would have the same magic-defying properties as the building had. I set off to find a craftsman to accomplish infusing this into a breastplate.