Soul Casting - The Most Economically Significant Aspect of Soul Castors

Nivani is famous for her research into the power of ancient fabrils. We see this in a contraption that nevani engineers to raise archers up and give them the high ground advantage. Soul casters are considered wholly by the voren church, only able to be used by specific ardents who have been trained on them. You can literally create a grain with a sole castor.