Bide

When you cast this spell, increase your AC by 1.

The first time each round you are hit by an attack, while you are concentrating on this spell, your AC increases by 1.

When this spell ends, you unleash a violent burst of captured kinetic energy at a creature within 30ft of you. That creature takes 2d8 force damage for each point of AC you gained from this spell’s effect while concentrating on it.