One of the 15 Hermetic Arts, Terram is the form that concerns solids, especially earth and stone. Although Terram magic can affect the very foundation of the world, the earth proves resistant to manipulation. Just as stone is heavy and hard to lift, it is inert and hard to change, even through magic. Prior to the formation of the Order, the Founder Guernicus and his pater were the last known surviving practitioners of the Mercurian equivalent of Terram magic. In fact, it was this knowledge that lead to the torture and murder of Guernicus' pater and the Founder's quest for vengeance.