Chargestone

Possessed of an unusual understanding of lightning and stone, a wizard of air and earth may bind energy accumulated through the use of shockcraft into an object made of opal. Once so bound, this power will be transformed by the earthen magics, and may later be released by destroying the object. The energy will seep into whoever destroyed it, granting him physical resistance and additional hit points. Those trained in the shockcraft skill will be able to harness the power more efficiently than those who are not, but all may benefit. The amount of power granted depends on the amount originally infused into the opal, and a certain minimum charge is required to make a chargestone in the first place.

Though the opal may retain its charge for some time, it will eventually dissipate, leaving the object as it was before.