We see that Sivana also has a copy of Society of Super-Heroes, and it’s what gave him the idea to communicate with the Sivanas of the multiverse. This page also has the only mention/showing of Ultra Comics in the issue, in the form of the close-up on the page from Society of Super-Heroes where the Atom is reading it in Doc Fate’s tower. I suspect it’s no coincidence, as a result, that this world where nobody reads Ultra Comics is also the only issue so far that doesn’t end on a cliffhanger (or, in the case of Pax, begin on one). Sivana’s comment about the Earth never being enough for him is a reference to his time spent raising his children on Venus prior to meeting Captain Marvel, where he also met the mind-controlling caterpillar Mister Mind, who actually formed this current multiverse way way back in 2007 at the end of 52.

As for the Sivanas of the Multiverse on the bottom half, some of the Earths are pretty easily recognizable — the black Sivana is probably from Earth-23 (where Calvin Ellis is from), the lady Sivana from gender-swapped Earth-11, the vampire Sivana from the vampire Earth-43, the snake Sivana from Captain Carrot’s Earth-26.

I’m really looking forward to finding out more about Earth-Luchador, although probably not as much as Chris Sims is.

In any case, the mechanical Rock of Eternity Sivana used to contact the alternate Sivanas is the closest this book comes to having a Transmatter Symphonic Array like the ones built by Lex Luthor, Doc Fate, Alexis Luthor, etc.