Breathblock

You create a wall of magical energy 5ft. in front of you, any creature behind the wall gains a +2 AC, and if a creature uses a breath weapon on the wall it automatically halves the damage, potentially allowing the creatures behind the wall to take only a quarter damage. Alongside that the creature that uses a breath weapon on the wall must make a Wisdom saving throw or suffer 2d6 force damage. The wall is 20ft. wide, and 20ft. tall it is half an inch thick and stops spells from going through (Such as Detect thoughts which can't penetrate certain materials). The wall can be passed through without issue.