Created by the Anti-Monitor in order to facilitate his plans to feed on New Earth and the Multiverse. Co-created by Sinestro to instill fear in the Universe and the Guardians of the Universe so that they would be forced to change the laws of the Book of Oa. The Parallax entity is a space parasite that is the embodiment of fear that was imprisoned within the Central Power Battery on Oa. After a long time, the entity became known as the yellow impurity, the cause for the Green Lantern's weakness with the color yellow. After Sinestro went rogue, he was banished by the Guardians of the Universe to Qward in the Anti-Matter Universe. When he returned, he wielded a power ring which used yellow energy. After various encounters with Earth's Green Lantern Hal Jordan, he was imprisoned within the Central Power Battery. There he was able to use his ring, which uses fear, as opposed to willpower, as a power source, to awaken Parallax from hibernation. From here, Parallax and Sinestro were able influence the fall of Hal Jordan and instigate the fall of the Green Lantern Corps, leaving one last Green Lantern: Kyle Rayner.
Lantern Oath
"In blackest day, in brightest night,
Beware your fears made into light.
Let those who try to stop what's right
Burn like my power--Sinestro's might!"
According to Ethan Van Sciver, the ring's symbol is based on ancient carvings made by beings who had looked into the gullet of Parallax and survived.
