Parallax (Earth-6531)

"Fools taking up arms against fear. They rush head-on into their oblivion. So I shall provide them with a most glorious doomsday! The universe will run red with blood. But in the end, as always, Parallax will stand triumphant."

- - Parallax

Parallax was an entity that resided within the yellow energy of fear, serving as a true manifestation of fear, which made the Guardians of the Universe insecure about attempting to harness it, instead opting to use the Green Energy of willpower. However, Krona, one of the Guardians, chose to ignore his fears, and, in an attempt to harness the Yellow energy, was absorbed Parallax, who used his body to continue his work of spreading fear through the universe.

Creation
When the Guardians of the Universe arrived on Oa, they found the energy of Willpower, but also Fear, which they distanced themselves from in their fear of becoming corrupted with its tainting energy.

Rise and Banishment
However, one of them, Krona, believed they could use this power to help the galaxy, much like they did with Willpower. Even though his siblings banished any contact with it, Krona secretly touched the Yellow essence, and was overcome with its corruption, enfusing into a monstrous energy being that would be known as Parallax.

The Guardians were then forced to combat Parallax, who was able to consume nearby planets and absorb others into his own. Using all of their powers in unison, the Guardians were able to trap Parallax, although not destroy it, at the world of Ryut, which would become a part of the Lost Sector hundreds of years later.