Almost Done
The haven of ores was just like what its name described. It would create a large world where thick veins of different ores would appear and grow higher in grade.
It's only harsh requirement was for me to provide the different types of ores I wanted this artefact to produce at the start. Considering that my world here and at second Earth already got high grade ores made me hesitate to place great value over this artefact.
However who would say no to more wealth and power? High grade ores wouldn't just serve my kingdom in the yet to come expansion, but they could be sold at any market for a high price.
In exchange for them I could ask for anything in return.
But the condition of gathering all the ores I needed to have before activating it was a sort of limitation in my eyes.
If it could produce other ores later, it would go without any hesitation in that list.
After a long time of contemplating, I decided to enrol it in my highly valued list of magical artefacts.