It's interesting to contrast Grandmother's words from the trailer for episode 8 with the ones that Vrille used before she killed her mother.
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Grandmother> "I promise...
and help you to understand.
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Vrille> I want to help you, help you understand... what it is like to be me!
And now about the Sol as a destroyer, it is interesting to note that Roman Sol Invictus came from Syria (Heliogabalus), and is related to ancient cults also connected with ancient Greek tradition and specifically god Helios whose other name is Apollo that actually means "destroyer".
But I think that there is another meaning behind destruction here, especially in our show
I guess we'll have to wait and see. I hope Aaron has some idea of an endgame because I don't like to have
mysteries without some cohesive elements and threads, and so I hope he'll stay true to his mythology and ideas.