A basic effect common to earth mages is that increases the natural thickness and callous of the skin.
It is a natural occurrence for most Geomancers that when attuned to their element their skin seems naturally thicker to the touch while not hindering their movement in any way. This is an effect of their element that naturally strengthens the bodies skin with earth-attuned magic that while negligible in its actual protection is a precursor for further enhancement later.
Stoneskin is a precursor to stoneflesh; A much more profound magical protection an earth mage can attain through training and attunement with their element.
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