Brainiac 13 was able to work with Brainiac 2.5—now transferred into the aged body of Lena Luthor—and prepared a tactic against Imperiex for the upcoming Imperiex War. The Brainiacs successfully engineered Imperiex's defeat, allowing Brainiac 13 to absorb Imperiex's power and use it to overpower the combined heroes and villains of the universe while simultaneously devastating both Earth and Apokolips. Brainiac 13 planned to use the power he stole from Imperiex to conquer the universe and reshape it in his image, and is made so powerful by the absorption that none of the heroes, not even Superman, can hope to damage him. However, with help from Lex's temporal displacement technology and Darkseid's Boom Tube technology boosted by magic supplied by Tempest and the Amazons, Superman was able to destroy Brainiac 13 and Imperiex by sending them through a temporal Boom tube where they were annihilated in the Big Bang. Brainiac 13 had his body disintegrated and the remnants of his mind scattered across sixty trillion light years, finally killing the chronologically last known version of Brainiac.