These ancient conductors of magic utilize the world and it’s natural elements to survive. They are the root birth of mages within Spectra, all other exchangeable magic users come from the Ground Swellers.
The natural world is their domain. Everything from grass to simple forms of life are the Ground-Swellers’ tool. Like many other mages, they must use Spectralium to conduct magic from the ground. While this is necessary, it does not limit what they can do, they are sometimes capable of constructing whole suits of armor from a single piece of bark.