The One And Lucifer
-----
Although Noah had yet to meet him, The One knew very well of his existence, this Primordial Deity also knew that he was the child of Azathoth, and therefore, was classified as a Primordial Children.
What are Primordial Children?
They are entities of incredible power with endless potential, born from the three Primordial, sometimes they're only born from one of them, and are more like small clones that take independence.
Other times, they're born from the combination of the Primordial Divine Essence of two Primordial, these children are often attributed with even greater power than those born from a single one.