Dispel Magic
I use my knowledge of the Ethereal to Dispel Magic.
This spell causes all spells active of 6th level or lower to be removed from the target. Spell shields will protect against this spell but they themselves are consumed in the process.
Creatures of Magic such as Displacer Beasts or Celestial Guardians also take body damage from this spell in the amount of 50 hit points of damage.