Wall of Crystal

You create a large wall of crystals to hinder your enemy. When you cast this spell, you create 6, 10 ft by 5 ft crystals. The first crystal can be anywhere within range, and the remaining must be connected to another crystal. Every Crystal must touch the ground and rise either 15 ft in the air or until it reaches the ceiling. Any creature standing where a crystal is summoned must move to the nearest open space (in the direction of their choice, this does not provoke attacks of opportunity).

Each Crystal has 50 HP and an AC of 12. It Resists Slashing and Piercing damage and is immune to psychic damage. When it is reduced to 0 HP, the crystal shatters. Any creature within 5 ft of a crystal when it shatters must make a DEX save vs your Spell Save DC. On a failure they take 3D6 Piercing damage, or half as much on a success. As an action, you can shatter a crystal.

While active, you may cast your spells trough any of your crystals, as though you were standing in its place. When the spell ends or you lose concentration, any remaining crystals crumble harmlessly.

At Higher Levels: For every level over 4th level, you can create an additional crystal, the AC of each crystal increases by 1 per level, and they gain an additional 10 HP per level.