The Rock of Eternity was a place that did not exist in any physical sense. Though it was fairly large, its energy level was actually not as high as Limbo's.
It had once belonged to the Council of Eternity, that group of immortals who had planned to surrender to Barbatos during the Metal Event.
The Legion of Doom's current base, the Fortress of Eternity, was paired with the Rock of Eternity: a vast foundation divided into seven realms, and a small castle within it that could detach on its own.
If the Rock of Eternity was a teapot, then the Fortress of Eternity was the matching teacup. In truth, both the teapot and teacup could be used separately.
The Rock of Eternity was currently half-abandoned. Shazam and his little friends sometimes went there to play, but no one should expect a bunch of children to clean the place.
Su Ming did not care whether the world changes caused by the Upside-Down Man had affected Shazam and Black Adam. He merely had his eye on the Rock of Eternity's secrecy and convenient access.
By now, Luthor had probably slaughtered most of the Council of Eternity. That meant that aside from Luthor, the current master of the Fortress of Eternity, no one else knew the Rock of Eternity's location.
And if Luthor dared return the Fortress of Eternity to the Rock of Eternity, that would be even better. Su Ming would take him out on the spot.
Su Ming understood Bobo's concerns as well. He simply felt that hiding beneath the enemy's nose was somewhat dangerous. But Luthor's attention was now entirely on the Totality, and since the Fortress of Eternity had been seized in the first place, he would never discover that Su Ming had gone to the Rock of Eternity.