Power Gem
these powerful stones emit an aura which disrupts starship energy shields, but their power faded after they were mined. They were determined to be pieces of rare meteorites which broke off from a single meteor. The pirates of Iridium used these power gems to disrupt the shields of the starships they attacked, making it easy for them to loot the defenseless ships. The pirates were eliminated by the Jedi Knights, and it was believed that the power gems were all destroyed in the battle. However, the last usable power gem was held by Raskar until someone could best him in battle and take it. What he didn't tell anyone is that the gem contained only enough power for one last use. Han Solo and Chewbacca were able to defeat Raskar and take possession of the gem, which was turned over to General Dodonna some years after the Battle of Yavin. The gem was used in a valiant attempt to disrupt the shields of the Executor by Vrad Dodonna, but the gem's failing strength only opened a small hole in its immense shields.