Wrathstone has made Heelspike rich or rather it has made the noble families rich.
This magical stone is mined in the mountains that Heelspike controls.
It's even mined within the city itself in the Maddening Mines.
It is used to darkly magically animate the inanimate. Want a wagon pulled? Wrathstone will generate sinister spectral horses to pull it. Want the front of your theatres sign to move and light up? It does but with strange details and a spooky light.
Most see the benefits as outweighing the diabolic nature of the magic and as a result the Kingdom of Gesh, Pelan Empire and Lostvaria all import large amounts making the city of Heelspike rich and powerful.
There are those who think that this gift of the dark gods may not be used without consequence but such critics are often silenced.
The stone itself has a shiny black surface that they say people see ghostly figures in.