Polish (3.5e Spell)

On any stone surface you can polish it to become extremely smooth. If a wall, the climb DC increases by +10. If the floor it becomes smooth and slippery as glass incuring an effect like Grease. Finally it can be used to turn up to 50 normal rocks into masterwork sling ammo for the duration. Doesn't work on non-stone surfaces, and magical items get a Fortitude saving throw to negate.