The Wand of Shattering was used by the clean-up crews of the mage-lords to get rid of destroyed wizard towers and buildings. The magically enhanced stone is almost impervious to pick-axes and normal tools. So the crews have to employ these wands to clear up the rubble that is left when mages throw incredible magical powers around in an attempt to destroy their rivals. The wand was found when diggers stumbled upon a closed off cellar in which the poor crew was trapped when it collapsed. It must have happened very suddenly, because they could not use the wand to escape.