What is rock of eternity?

The Rock of Eternity is a mystical location in the DC Comics universe. It is a floating island and the home of the wizard Shazam, who gives the powers of Shazam to those he deems worthy. The Rock of Eternity is often depicted as a place of great power and importance, and many characters seek it out for its magical properties. In some versions of the story, the Rock of Eternity is said to be the birthplace of the gods and the source of all magic in the universe. It has been featured prominently in various DC Comics such as Shazam, Justice League, and Superman, among others.