Wonderwall

The caster plays hit song Wonderwall by Oasis, casting a flat magical barrier within 25ft of the user. 

The wonderwall nullifies all magic or spell damage from both sides of the wall, and prevents melee attacks from going through it

As an action, the caster may reposition an already cast Wonderwall within 10ft of its original casting position

If the wonderwall is used to squish a creature into a non-magical wall, that creature takes 2d8 force damage, and the wall dissipates instantly

Both wonderwalls will shatter if they make contact with each other

A creature may roll a STR throw as their action if they wish to attempt to shatter the barrier with a DC of 24

If the Wonderwall is not shattered after 3 rounds, it dissipates