Alright this story has come to an end and Death Metal is about to begin, so let’s talk about how we get there even though we are already aware of certain things aren’t we so honestly I’m not bothering with spoiler marks.
So oddly enough, Luthor actually wins...in the beginning anyway. He brings his army of villains, his mech suit, and even deduces that Batman who laughs is deteriorating and needs his visor to stay in this dimension. In fact he has a cure and gets it into Batman who laughs and cures all the infected including the Secret Six. Luthor wins.
But then Perpetua happens. Batman who laughs reveals what happens at the end of Justice League which he learned from the capture of Phantom Stranger in issue 1. What ends up happening is that Perpetua depowers Lex, making him no longer Apex, and sides with The Batman who laughs and is preparing to stop what the Justice League has planned. Lex is left alive with Mercy on earth.
So basically what you need to know from this mini is that Lex Luthor is human once more and Perpetua has allied herself with the Batman who laughs. Honestly this was not a terrible mini-series but it’s pretty evident that this was just supposed to be filler to get us from Justice League to Death Metal. If I had to grade it based on that it did it’s job, but it’s by no means it’s own standalone series from all the stories it’s building up from and what it’s going to.