The episode had me thinking so much about the lore of the force and how it functions across the universe.
The Nightsisters worship the fanged god and the winged goddess (the Son and the Daughter), and I assume this practice is as ancient as the Nightsisters themselves. In the Mortis arc in The Clone Wars, the Father explained that the balance between his children affects the entire universe. The force permeates and binds all that exists, even if it’s known by different names in different places. Nightsister magic is a very alien way of wielding the same force. I think most of us already knew this, but seeing it being told means so much.
Mortis shifted between day and night at any given moment with the constant push and pull between the Son and Daughter. Baylan describes this continuous pattern when Shin asks him what he sees. We’ve seen so many empires rise and fall and eras of peace through the galaxy’s history. I remember reading about the history of the celestials and them naming the cyclical tug between light and dark “the star wars.”
I think when the Father asked Anakin to take his place, he was really prophesying, because this is exactly what Anakin has done. He has truly mastered the light and dark and uses them in harmony, as he does to teach Ahsoka in the World Between Worlds. He has ascended to his final form as The Chosen One and is guiding her in her destiny to become the light. I feel more sure than ever that Ahsoka will be the new embodiment of the Daughter. When the new Daughter and Son ascend, he will have brought balance once and for all.
Killed on Tatooine by stormtroopers, Luke encounters the Son and Daughter. He has a connection to them, especially the Son, which is allowing him to stay partly in the physical realm, at least enough to get to know his father. But soon, he realizes he isn't the only one with a connection to the Ones.