Arcane Breaker

You can break magic with the sheer power of your body.  When you are faced by a spell which creates walls, unbreakable or not, such as Wind Wall, Wall of Force, or Forcecage, you can shatter the spell.  Make your attack rolls and roll for damage as normal, targeting the arcane fabric within the wall itself.  Each time you damage the wall, the caster of the spell must make a Constitution saving throw equaling 10 or half the damage you inflicted to the wall, whichever number is higher.  On a failure, the magic breaks and the spell ends.  On a success, the spell isn't affected.