Water or Blood
The Lost Mines of Devlar
These mines were originally made to quarry a vast Starmetal meteor that fell to earth, but when that was exhausted it was found that the lingering magic of the meteor had twisted the surrounding earth into Breathstone.
This was harvested carefully for years until the whole structure collapsed and eater raids made the territory inaccessible.
The complex sits abandoned in the mountains north of Heon, many think of reclaiming them, or visiting to steal some of the valuable ore, but few manage the dangerous task.