Tenacious Plow (T3, W3)

Level12

You conjure a magical 10-foot-square vehicle in an unoccupied space within range. For the spell’s duration, you can take a move action to slam the vehicle into a creature within 30 feet of the vehicle’s current location, moving it to an empty space adjacent to the target and dealing 6d10 bludgeoning damage (Reflex negates).

If you don’t move the vehicle, it remains where it is and doesn’t deal any damage to any creatures, even if a creature is adjacent to the vehicle. The vehicle can’t hold any occupants or be damaged.