A 15-foot wide, glowing, transparent barrier appears within 5 feet of you with 1d10 + 15 hit points and an AC of 5. 

The barrier provides total cover for those behind it. Any attacks aimed at those on the opposite side of the barrier are instead directed at the barrier. It counts as a construct and has immunity to poison and psychic damage. When the barrier reaches 0 hit points, it disappears unless the caster expends a spell slot as a reaction to restore its hit points. 

As a reaction or action, the caster can expend a spell slot to restore the barrier's hit points. The hit points regained are 10 for each slot level above 1st.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the barrier's hit points increase by 5 for each slot level above 2nd.