This spell works just like magic missile, except that you may create one missile per caster level, and each missile does 4d4 points of damage. Unlike magic missile, the missiles created by this spell can be used to damage or destroy inanimate objects; target them as you would target a creature. You can only target unattended objects; trying to target an object in a creature's possession results in the missile striking the creature instead. For very large objects, such as a castle wall, each 25-ft. section of the structure is treated as a separate object and must be targeted separately. As with creatures, you cannot single out a specific location on an object for the missiles to strike.