He-guy88
AntiMatter Corps
not to jump off of subject but who else new this cause i had no idea
Parallax was actually an ancient demonic parasitic entity dating back to the dawn of time, that actually was the sentient embodiment of fear, and which traveled from world to world, feeding off the fear of sentient beings, and causing entire civilizations to destroy themselves out of paranoia.
It was this creature, yellow in color, which the Guardians of the Universe imprisoned within the central Power Battery on Oa using fear's opposite energy, willpower. Parallax had lain dormant for billions of years, his true nature covered up by the Guardians to prevent anyone from trying to free it, and thus, it had eventually come to be referred to as simply "the yellow impurity." This was the reason why the rings were useless against the color yellow: Parallax weakened its power over the corresponding spectrum, and hence only someone capable of overcoming great fear could master the power ring. 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, allowing it to reach out to Hal Jordan through Jordan's own ring when Jordan was at his weakest, spending years influencing him, causing him increasing self-doubt, and even causing his hair to turn white at the temples. Parallax's control over Jordan exploded with Jordan's grief over the destruction of Coast City, and it was Parallax who was responsible for Jordan's subsequent murderous activity, his apparent killing of Sinestro (which was later revealed to be an illusion on Sinestro's part, created as the final stage of Jordan's susceptibility to the impurity in order to break his will), and Jordan's destruction of the Central Battery, which allowed Parallax to graft itself onto Jordan's soul.
It was because Parallax was now free that Kyle Rayner's own ring did not have any weakness against yellow, and the Spectre explained to Jordan that it drew in Jordan's soul in hopes of eradicating the parasitic Parallax from it. The Spirit of Vengeance eventually removed Parallax from Jordan's soul, and itself from Jordan, departing in order to move onto the next recipient of the Spirit, while Ganthet guided Jordan's soul back to his own body, which had been preserved by the remnants of the energies Jordan had used to reignite the Sun during Final Night.