Carlisle's Guard

You create 3 glowing orbs that encircle and protect you, and grant a +1 bonus to AC for each orb that appears. When a creature makes any attack against you, regardless of whether it hits or misses, an orb is consumed and your bonus AC is reduced by 1.

As a part of casting this spell, or as a bonus action on subsequent turns, you can consume all remaining orbs to deal 1d4+1 force damage per orb to all creatures within 5 feet. This effect can also be used as an opportunity attack, but only if the caster has the War Caster feat.

If all orbs are consumed, you lose all bonus AC and the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the spell creates one more orb for each slot above 1st.