Parallax was once one of the ten Guardians of the Universe. He was of the opinion that Willpower might not be enough of a viable power source for the fueling of the Green Lantern Corps. The Guardians are implied to have long ago fought a great war using Willpower against fear, and won. The repository of fear energy, the Yellow Central Power Battery, was stored within the Vault. This Guardian, by account with benign and virtuous intent, attempted to harness the power of Fear by entering the Yellow Battery. The power, however, was too corruptive. Robbed of his mind and will, he became Parallax, the very evil he had wished to stop. Seeing him as a danger to himself and the universe at large, the Guardians ordered Abin Sur to defeat Parallax. This he did, imprisoning the rogue Guardian on the