It's the prelude to "The Blackest Night" as the "War of Light" continues to intensify! Mongul attempts to establish his hold on the Sinestro Corps by enslaving the planet Daxam and making it the home world of his Corps. What does Sinestro's right hand man, Arkillo, think of all this? And will Sodam Yat, the Green Lantern known as Ion, fight to save his homeworld, which he's vowed to never return to?