Prehensile Hair

Through either the rigorous training and knowledge of your own body, or through application of Magic, you can cause your hair to grow, and be able to be used as a weapon.

You can cause the hair on your head to grow up to 10 feet long or to shrink to its normal length as a bonus action. While your hair is in it's lengthened state, you can manipulate your hair as if it were a limb, with a Strength score equal to your Spellcasting Score (Wisdom for Monks). Also while you your hair is in it's lengthened state, you can use your hair to attack, dealing 1d4 bludgeoning damage, based on your Spellcasting Score (Wisdom, or Martial Arts, for Monks). Your hair can manipulate objects, but not weapons as dexterously as a human hand.

Your hair has counts as a separate entity, with 1/4 (Rounding down) of your HP, all your resistances, immunities, and weaknesses, as well as resistance to bludgeoning and piercing damage but weakness to slashing, replacing any existing resistances, immunities, and weaknesses to do with these traits. Pieces cut from your elongated hair shrink away to nothing.