Dark Arts of the Black Knight
Prerequisite: Proficiency with martial weapons, and the Spellcasting or Pact Magic feature
Black Knights are taught to channel suffering into strength, drawing hidden force from wounds that would fell lesser warriors. You gain the following benefits:
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Increase your Strength score by 1, to a maximum of 20.
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While you are below your hit point maximum, your weapon attacks deal an extra 1 damage.
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While you are below your hit point maximum, when you deal acid, cold, fire, lightning, necrotic, radiant, or thunder damage with a spell or weapon attack, you can add your proficiency bonus to one damage roll of that spell or attack. You can use this benefit once on each of your turns.
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When you hit a creature with an attack made using a heavy melee weapon, and you moved no more than 10 feet on your turn before making that attack, you can unleash a brief force shockwave. One creature of your choice within 5 feet of the target takes force damage equal to your proficiency bonus.
You can use this shockwave a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.