These spells cause the caster's skin to become either iron hard or rock
solid. While affected by the spells the caster gains some bonus to their
armor class and, more importantly, physical attacks against them will be
totally negated until the skin is destroyed.
Stoneskin absorbs three hits before being shattered, while ironskin can
absorb twice as many hits. The absorbed hits are only from weapons or
hand to hand attacks, not from magical spells.
Only one of these two spells may be maintained on the caster at once, and the
mage must wait a few hours before recasting either spell on himself.