- "Fleeing for survival, this thing transforms into the emotional power it emits. Fear is born." --The Entity-possessed Sinestro speaking of Parallax's creation/transformation.
The emotion of fear was created from the White Light of Life after the Darkness mangaged to split it into seven component aspects. When this emotion was first diverged from the White Light, it became tied to the Yellow Light. Parallax was the first sentient being to experience this emotion, and thus tap into the power of the Yellow Light. Because of this, it became the living embodiment and source of the emotion.