|This spell hardens one's skin to a degree determined by one's skill in Earth Magic. It only works on relatively normal flesh, and will aid neither the undead nor the bodily transformed. However, there is one exception: the effects of this spell will be boosted for casters in Statue Form.|
Stoneskin is a level 2 Earth Magic/Transmutations spell which temporarily makes the caster's skin hard as stone. This grants a bonus to AC of 2+(Earth Magic/5). Casters under the effect of Statue Form receive an additional 1+(Earth Magic/4) AC on top of that. Each casting increases the spell's duration by 8+2d(spell power) turns, up to a maximum of 50.
Do note, however, that the spell will not notify you when its duration is almost over; should you be in the middle of a pitched battle, consider casting it pre-emptively partway through to ensure you keep your AC bonus until the end of the fight.
This spell conflicts with Ozocubu's Armour and cannot be used if Ozocubu's Armour is currently in effect. Apart from Blade Hands, Beastly Appendage and Statue Form, you cannot use this spell while transformed.