For Antiquities to advance, they needed the common people!
The quintillions of existences across Universes were the resource they depended on to obtain their Marks of Antiquity, as very few had the ability to traverse the Ruination Seas to search for, much less win against a Primordial Beast.
"Antiquities fight over the influence of their Universes and Cosmos, and Emperor Aegon revolutionized this as he created a vast Primordial Emperor with a myriad of Cosmos under his influence, all others working under him to oversee these Cosmos as it caused the rise of Kings below the single Emperor."
King Augustus spoke as if it was ancient history, Noah listening to his words carefully as he picked up on the name Aegon once more!
This was more than likely the terrifying figure he saw with the Primordial, many things fitting into place as Noah was gradually outing the pieces of the puzzle together.