Shatter Stone and Metal

This spell causes metal or stone objects, totaling no more than 5 pounds weight per level of the druid, to explode into shards of sharp projectiles. Items to be affected get a saving throw vs. crushing blow at -1 on the die roll for every two levels of the druid (magical items receive bonuses as noted in the DMG). Creatures standing within 5 feet plus 1 foot per 5 pounds weight of the shattered object are hit by the shards of the item. Shards inflict 1 point of damage per 5 pounds weight of the object. Damage taken is reduced by an amount equal to the target's Armor Class subtracted from 10; thus, AC 5 reduces the damage taken by 5 hit points.

The material component is a miniature stone hammer.