Ball of Stone
Conjuration (Creation)  {Chagode, Terra, Aerea}
Level: Sor/Wiz 5
Components: V, S, M
Casting Time: 1 action
Range: Long (400 ft. + 40 ft./level)
Target/Area/Effect: A ball of stone travels its line of effect
  and explodes at a range determined by you.
Duration: Instantaneous
Saving Throw: Reflex half
Spell Resistance: No
You create a ball of solid stone (2 foot diameter) which moves in a straight line away from you in a direction that you indicate. You must aim the spell with a ranged touch attack. Upon striking its target, the ball of stone deals 10d6 points of bludgeoning damage and explodes, causing 1d6 points of piercing damage/3 caster levels to all creatures within a 20 ft. radius burst. If you miss your target then the ball of stone explodes upon hitting the next solid object. All creatures affected by the spell may make reflex saving throws for one-half damage.
    Material Component: A carefully shaped spherical stone marble. Throw this at the target of your spell (treat as a ranged touch attack), and the marble will swell into a boulder.