The character transmutes up to three pebbles, which can be no larger than sling bullets, so that they strike with great force when thrown or slung. If hurled, they have a range increment of 20 feet. If slung, treat them as sling bullets (range increment 50 feet). The spell gives them a +1 enhancement bonus to attack and damage rolls. The creature using the stones makes a normal ranged attack to use a magic stone. Each magic stone that hits deals 1d6+1 points of damage (including the enhancement bonus). Against undead creatures, this damage is doubled (2d6+2 points).