Superman (Rebirth) #16

"MULTIPLICITY” finale! Superman, New Super-Man and Justice Incarnate make their last stand against their multiverse-spanning foe, and the Man of Steel discovers another clue to the truth of his existence.

Prophecy has captured Superman and throws him into a pit. Here, he meets other Supermen who were already captured. Subsequently, a familiar face joins them, it's Kenan, the Superman of China. Superman introduces himself to Kenan and they both agree they'd expected their first meeting to be different.

Ultimately, the Supermen are able to beat Prophecy. It seems that Prophecy dies, however that's not the case at all. He's vanished and now he's locked up by Mr. Oz himself.