surroundings manipulation

The caster point there hands into the direction of a wall, floor or ceiling, the surface ripest like rain hitting a puddle and then erupt into a shape of you choice (still attached to the wall) it stays there until dispeld or broken. The shape that you have chosen can either be a spick, cuboid or be told in detail to the DM. If the caster uses this spell to damage a target then it does so with a 1d12 bludgeoning or piercing DM's choice.