earthfast

you channel the power of elemental earth to strengthen the stone around you, all stone within 1000 feet of the stone you touch becomes magically reinforced gaining an armour class of 24 if it isn't already higher, additionally the amount of weight that the stone can bear without breaking is tripled. this spell only affects solid stone so loose earth and gravel are unaffected. the stone also becomes immune to magic that would change its form such as stone shape or minor alchemy.