Your uncanny ability to take a hit on the chin has transformed into the ability to reap arcane vengeance on any foe who dares attempt to strike you.
When you use your reaction to cast Shield on an attack that otherwise would've hit, you can, as part of the same reaction, fire off a magic missile at the target for 1d4+1 Force damage.
As a reaction, when an attack misses you, you may spend a spell slot to deal Force damage equal to the difference between the attack roll and your AC.
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