The piece that stuck out for me was the description of metallurgy and mining as Dwarvethurgy. I like the idea that some basic technologies would have been perfected by other races before humans, and that as a result, their naming may be quite different. The word for Mining in common could be different.
The party is walking through the forest at night when they come upon a clearing. Half a dozen black-robed corpses lie scattered across the ground, and a pentagram of blood is shoddily drawn in the dirt.
It seems these people summoned something they could not control. Whether or not the demon returns is up to the GM, but it would be just as rich if the demon never returned, and for the rest of the night, every stray sound or odd shadow will be jumped at!