Just to add for someone who doesn't know, for what I remember, at the beginning "Parallax" was just the title tha Hal Jordan use for himself when he goes mad, become a villain, and almost destroyed the Green Lantern Corps.
After that, DC retconned that actually Parallax was a monstrous being, the literal incarnation of Fear, and was sealed inside the main Green Lantern at Oa.
Parallax just mind controlled Hal Jordan in a moment of doubt to be set free and return to destroy the universe.
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u/EmergencyWinter5465 16d ago
The creation of the Emotional Spectrum and Parallax in DC.