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You can use this birthsign to cast the Knock spell. Once between long rests, you can choose to give yourself advantage on any ability check that you make.
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This spell slot's level cannot exceed half of your proficiency bonus (rounded down). When you succeed on a saving throw against a magical effect, you regain one expended spell slot.
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You gain proficiency in your choice of one of the following types of saving throw: Strength, Intelligence or Charisma. This effect does not stack with other effects that reduce damage by a set value. While you are wearing heavy armour, bludgeoning, piercing, and slashing damage that you take from non-magical weapons is reduced by 2.
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