Dispelling Barrier

This spell creates a transparent, permeable barrier up to 100 square feet in size which must be anchored on at least two fixed surfaces (such as a floor and wall, two trees, etc.). The next creature or object, other than those you designate at the time of casting, passing through the barrier is subject to a dispel magic spell of 3rd level. If the subject has no magical effects upon it, nothing happens, and the barrier remains. If the subject has magical effects upon it, it is affected by the dispel magic spell and the barrier is gone.

The barrier cannot be seen or felt by ordinary means, or even via a see invisibility spell; however, detect magic indicates the presence of the effect and true seeing reveals both its presence and its purpose.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you increase the level of the dispel magic spell effect proportionately.