Reference Book: Star Wars Saga Edition Jedi Academy Training Manual
Found on the planet Dantooine, Dantari Crystals originate in the eggs of the Kinrath, creatures native to the planet. Dantari Crystals were harvested in the ancient days of the Jedi, but once Ilum became a source or Lightsaber Crystals, few Jedi saw the need to deal with the deadly Kinrath. Dantari Crystals harvested from Kinrath eggs supposedly reflect the true disposition of their wielders. If you wield an attuned Lightsaber with a Dantari Crystal and roll a natural 19 on a Use the Force check made to activate a Force Power, you regain some of your spent Force Powers. If you have a Dark Side Score of 0, you regain all spent Force Powers with the [Light Side] descriptor. If you have a Dark Side Score of 1+, you regain all spent Force Powers with the [Dark Side] descriptor. If you roll a natural 20 on a Use the Force check made to activate a Force Power, you still regain all spent Force Powers.