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.
During The New 52, DC Comics' 2011 reboot, Ion and other emotional beings (except for Parallax) sacrificed themselves to enter the Source Wall after being led there by Kyle Rayner following the destruction of the Emotional Electromagnetic Spectrum by Relic.