The Yellow Impurity
Green Lanterns had a weakness against anything yellow. Their rings could not affect anything yellow and yellow bullets would pass through their shields. It was caused by Parralax , an evil alien entity that spread fear and weakness. The guardians sealed it in the main power battery on OA. But it was released during the Emerald Twilight story arc when Hal Jordan went postal and absorbed almost all the energy in the battery and Parralax fused w/ him. A GL who has no fear is not affected by yellow. +10to geek
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