it was nearly completely eaten. His soul not at peace, Hal then became the new Spectre to seek redemption for what he did as Parallax. The 2004 miniseries Green Lantern: Rebirth, written by Geoff Johns and penciled by Ethan Van Sciver, revealed that Parallax was actually a parasitic entity dating back to the dawn of time and born from the yellow of the emotional spectrum. The parasite was the sentient embodiment of fear, traveling from world to world and causing entire civilizations to destroy themselves out of paranoia. The Guardians of the Universe imprisoned Parallax within the Central Power Battery on Oa using fear's opposite energy, willpower, along with the aid of one of the fear's counterparts, Ion. Parallax had lain dormant for billions of years, its true nature hidden by the Guardians to prevent anyone from trying to free it. Being yellow in color, Parallax eventually came to be referred to as simply "the yellow impurity", a flaw, whose nature was kept secret from the Corps, that made their rings useless against the color yellow: Parallax weakened its power over the corresponding spectrum; hence, only someone with the willpower to overcome great fear could master the power ring. Thus, when recruiting new Green Lanterns, the Guardians were careful to look for recruits who could do this. When the renegade Sinestro was later imprisoned in the Power Battery himself, his Qwardian yellow power ring tapped into Parallax's power and awakened it. Since Sinestro harbored hatred for Hal, Parallax chose Jordan as its tool to free itself. Parallax apparently spent years influencing Jordan, causing him to experience increasing self-doubt as well as causing his hair to prematurely whiten at the temples. Jordan's grief over the destruction of Coast City let Parallax influence Jordan's subsequent murderous activity, his apparent killing of Sinestro (actually a hard light construct), and Jordan's destruction of the Central Power Battery. After it was learned something amiss was happening on Oa, a task force (as shown in the Emerald Fallout series), which consisted of Guy Gardner, Wonder Woman, Captain Atom, Alan Scott, the Martian Manhunter, Ferrin Colos of the Darkstars, and Arisia, ventured to Oa to discover the cause of Guy Gardner's visions of its destruction that were brought about by him wielding Sinestro's power ring (which was also fueled by the power expelled by the Guardians, their rings, batteries, or Parallax himself). On Oa, the task force