Walk around an area with Bubotubers near a cauldron. Use Wingardium Leviosa on the Cauldron to lift it in the air, then move the cauldron towards the Bubotuber. A successful hit will explode the cauldron and the Bubotuber and clear the way. If the explosion is near a creature, they will take damage. The best place to try this at is Dragon Woods, near the dragon fly-by. This works best with one or more players.
Defense against The Dark Arts
Finish the opening level.
Hogwarts Exterior
To destroy smaller monsters easier, use Wingardium Leviosa and throw them off the edge. Note: This does not work in the Avifors Dugbogs thing.