The Indigo Lantern Central Power Battery was a device located on the planet Nok that was designed to serve as a repository to the Indigo Light of Compassion within the Emotional Spectrum. Its source came during the old history of Nok when it was being enslaved by aggressive explorers. These beings took the natives as slaves and shipped them off world. However, a group of natives found a wellspring to the power of compassion within a cavern that came from an unknown source from deep within the planet. The inhabitants coated their weapons with the Indigo Light that when it struck their attackers left them feeling remorse and regret over their actions. At the time, the Green Lantern Abin Sur arrived on the world and managed to defeat the alien invaders whereupon he met with Natromo. The two d