Hal Jordan's enemies: Romat-Ru
When Romat-Ru was arrested by Xudarian police following a minor charge, an investigation team was sent to his home. There, the police found the remains of thousands of children. The story of Romat-Ru, one of the most horrific serial killers in the universe, was born. As the Xudarian butcher was being escorted to prison to face multiple life sentences, he escaped justice when he was liberated by a Sinestro Corps ring. Romat-Ru was recruited into the Sinestro Corp and transported to Qward. During the Sinestro Corps War, Romat-Ru engaged in combat with a number of Green Lanterns, notably Lantern Tomar-Tu of Xudar sparking a personal rivalry between Xudar's worst monster and it's young hero.