As part of The New 52, DC Comics' 2011 reboot of their entire superhero continuity, Ion and the other emotional entities (except Parallax), following the destruction of the Emotional Electromagnetic Spectrum by Relic, sacrifice themselves by passing into the Source Wall after being led there by Kyle Rayner.
In The New 52, DC Comics' 2011 reboot, Ion and other emotional entities (excluding Parallax) sacrifice themselves to enter the Source Wall after being guided there by Kyle Rayner following the destruction of the Emotional Electromagnetic Spectrum by Relic.