Force Field

The force field is an object in scribblenauts that repels all objects that are moveable away from itself, including the player. if dragged on to the player, you can ride it like a vehicle. It goes very slowly, but you are almost indestructable in it. It appears in-game as a blue-white bubble that hovers around. If shot at, the projectile is shot away.

Forcefield Strategy
if you have an extremely tough enemy, get in a forcefield and spawn a long-range weapon, like an RPG. The enemies are repelled, and you can easily attack them!