In the present era, Doctor Sivana accidentally freed Black Adam from his imprisonment, leaving the latter to continue his crusade of “justice.”
So when Aman next said “Shazam,” Adam also said the word, killed his nephew and let the magic lightning strike him, thus receiving the full powers of Black Adam.
In this continuity, Adam was a Kahndaqian slave who escaped captivity with his nephew, Aman.
He soon eliminated all of Kahndaq’s warlords and ruled over the country in a way he perceived to be fair, but after the magical council learned that Aman was dead, they fought Black Adam and locked him away.