Wall

You summon a magical barrier within range to protect your allies from attacks. This barrier takes up 5 foot of space and cannot be cast in a space that is already occupied. The wall acts as an obstacle that can grant a creature half cover from attacks that it intercepts. The barrier is a physical object and can only be destroyed by either a dispel magic or a disintegrate spell, the wall is transparent, and it hovers one foot off the ground meaning small creatures do not get three-quarters cover or full cover (unless the spell's caster is of a specific level). This spell’s effect increases when you reach higher levels. At 5th level, you can now summon 2 walls instead of one, and you can either choose to place these walls in different places or you can place one wall on top of another to increase its cover total from half to three-quarters cover. At 11th level, you can summon three shields and can place all three together to increase the cover it grants to total cover. At 17th level, this bonus increases once more to a total of four barriers.