After the resurrection of Hal Jordan, it was discovered that his nemesis Sinestro had also survived. His earlier death at the hands of Jordan on Oa were revealed to had been a hardlight construct created by the Parallax Entity. The Korugarian later journeyed to the Anti-Matter Universe where he enslaved the Qwardians, forcing them to forge thousands of yellow power rings as well as a Central Power Battery. This massive repository of energy contained the aspect of fear within the Emotional Spectrum and was used to power a number of smaller power batteries. These in turn were used by the newly formed Sinestro Corps in their service of bringing order as well as fear to the universe.