Let the Mage first be expert in raising and directing energy, and also with Change Self.
He shall then proceed to enflame himself, directing the energy to his skin. He shall also differentiate this energy to the appearance of stone.
This process should be continued until a physical sensation is felt. This may be a tingling or numbness of the skin over the entire body, or perhaps a certain rigidity in the joints.
While this spell is most useful for combat purposes, it is also useful during arduous work, sports activities and adventure activities such as rock climbing.
Note that this spell may also be used to strengthen bones or add resilience to the sinews.
