According to the Rider-Waite tarot cards, the High Priestess is an intuitive archetype and has an acute awareness of the subconscious. We can see this in the water motifs, symbolising the intuitive, and the presence of the moon at her feet, indicating the subconscious mind.
She knows the true answer to all things spiritual, and guides with an inner voice. She holds what appears to be the torah, and sits between two pillars that represent opposing forces. She guides with her inner voice, and is not loud or forceful in her teachings.
The crest associated with this archetype is the Crest of Seiros. Based on the name, I believe it may be a misspelling of Seirios. This is an Egyptian Dog-Star that was seen as a precursor to droughts depending on its placement in the sky. Curiously, it may also be the same star as Sirius, which is the star that Sothis is meant to be.
The dragon associated with this crest is the Sky Dragon. The sky can represent things beyond our comprehension. Things that are literally above us.
The kanji word for “Sky” is also the same word as the one for Space or Void. As discussed in the previous post, Space (Void/Sky) is one of the five elements in Godai Philosophy. It represents the emptiness before something is about to happen.
The character I find relates best to all these traits is Rhea. Not Seiros, but Rhea. She, like the archetype depicted in The High Priestess, knows the true history of the world, because she was there. Fittingly, she is the spiritual leader of a continent, advocating for peace instead of warfare. Her crest is highly related to the star Sirius, which may be a representation of Sothis. Not only that, but Rhea herself longs for Sothis dearly.
The final point about “Sky” is my own interpretation. I think that her life is filled with possibility, as she still has a long life ahead of her. However, she has trouble manifesting the things she wants, leading to her life being filled with an emptiness that is waiting. Or possibly, the emptiness is the waiting for Sothis to return.