after dawn granger uses her abilities to destroy the black lanterns, cassie and the others travel to coast city in order to assist barry allen and hal jordan in their battle with nekron, the leader of the black lantern corps. to the horror of the gathered heroes, nekron uses his abilities to transform several once-dead heroes into black lanterns, including superboy, kid flash, donna, and wonder woman. in the ensuing battle, cassie is killed when donna troy violently tears her heart out. however, it is then revealed that the entire battle was an imagination of wonder woman, and cassie is shown to still be alive. when black lantern conner attacks cassie, all the while attempting to break free from the black ring's control, conner manages to break the control in temporary, short lapses, which he uses to alert cassie about the solution to his black ring problem. the battle moves to the fortress, where cassie realizes what conner was referring to when he told them to move to the fortress of solitude conner's corpse, placed where he awaits his resurrection in "". the black ring, confused, leaves the living conner and tries to attach itself to his corpse, but conner awakens his freeze breath ability, which freezes the ring, and cassie throws it into orbit. after reconciling, the pair heads back to coast city for the final battle with nekron's army.