- "I watch the first sentient creature in the universe to ever will itself to move...do just that. And it is the origin of willpower itself." --The Entity-possessed Sinestro speaking of Ion's creation/transformation.
Willpower 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 Green Light. Ion was the first sentient being to experience this, and thus tap into the power of the Green Light. Because of this, it became the living embodiment and source of will.