Crystalline Ward

As a quick utterance and or a gesture with your hand, you conjure a thin, glittering barrier of crystal to deflect harm. When you cast this spell, you reduce the damage of the triggering attack by 1d8 + your spellcasting ability modifier. If the attack would deal force damage (such as from magic missile), you instead become immune to that instance of damage. Additionally, if the damage is completely negated, shards of the crystal ward burst outward. The attacker must succeed on a Dexterity saving throw or take force damage equal to your spellcasting ability modifier (minimum 1).

At 5th level, the reduction increases to 2d8, at 11th level to 3d8, and at 17th level to 4d8.