[@ShwiggityShwah] Mr/Mrs Doctor and said secret society do sound intriguing indeed. I'll give the concept the nod to see where this shall go.

[@Athol] I would allow this as Soul Stone Powered Cannons are something I was thinking to include on the majestic Flying Machines. The only thing about it is a Soul Stone only has so much power and the Shots will eventually "burn them out" and you'll have to switch it after a few shots. Also if you are using normal ammunition and using the Stone to propel it normal inaccuracies of the Musket would apply. If firing magical shots it just won't pack the same punch as a solid round :)