What if Clerics have an airwall like "Tear" that becomes painful! Since walls proceed in their increments (e.g., a new wall at 5,10,15,20,25,30) so will the pain. Kind of like Cold wall Mages receive or Mana wall for Archamages. Although, the pain inflicted when opponents step thru or are near the barrier?
We can have it come with a pick at 7 for barriers path. However, and please do not hesitate to add your own suggestions in response (please response I, Sorien, Kura, and many others value your feedback!).
NOTE: It increases in pain every 5 levels, like walls are awarded. Its pain exceeds that of Bleeding III.
NOTE: The level in which the wall is awarded is also debatable. Something that would come with 15th pick, say level 14? NOTE: The name is also debatable. Maybe just, "Poison".