Stone shape

Stone Shape is a transmutation spell that reshapes stone objects.

Effect
You can form an existing piece of stone into any shape that suits your purpose. For example, you can make a stone weapon, a special trapdoor, or a crude idol. Stone shape also permits you to reshape a stone door to make an exit where one didn’t exist or to seal a door shut. While it’s possible to make crude coffers, doors, and so forth with stone shape, fine detail isn't possible. There is a 30% chance that any shape including moving parts simply doesn't work.

Arcane Material Component
Soft clay, which must be worked into roughly the desired shape of the stone object and then touched to the stone while the verbal component is uttered.