The Ion entity is the physical embodiment of "willpower" on the Emotional Electromagnetic Spectrum. The Guardians of the Universe harnessed its energy to create the Green Lantern Corps, giving every Green Lantern a power ring controlled by the strength of their will. It has had multiple mortals to serve as its host, including Kyle Rayner and Sodam Yat. The Ion entity was created by Geoff Johns and Ethan Van Sciver, first appearing in Green Lantern: Sinestro Corps Special #1. (2007)

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