Alchemical Shield

You have invented an alchemical shield, able to momentarily bolster the defenses of yourself or an ally. When you or another creature you can see within 5 feet of you is hit by an attack roll, you can use your reaction to activate your invention. You grant a bonus to the target’s AC equal to your proficiency bonus against that attack roll, potentially causing it to miss. You can use this reaction a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

You learn the Cure Wounds spell. You can cast this spell without expending a spell slot. Once you cast this spell in this way, you can’t do so again until you finish a long rest. You can also cast this spell using spell slots you have. The spell’s spellcasting ability is Intelligence, Wisdom, or Charisma when you cast it with this feat (choose when you gain the feat).