Google is absolutely terrible lately. Thought I would just ask here. Is there a full size image of The Lovers and The Sun card shown in a very specific endgame battle?
I have my own theories of what those two cards' significances is. As any AST player would know, there's only six major arcanum: The Spire, The Balance, The Bole, The Spear, The Ewer, and The Arrow. And Koji Fox at one point said the Deck of Sixty has existed in every astral era, even beyond the third astral.
First theory: The Lovers and The Sun are just an earlier iteration of The Spear and The Balance cards respectively. Since the goddess's appearance is shaped by worhipper's prayers, her cards could have been artifacts of the past. There's still the fact that it's different from the image from the constellations but the tying of the constellations is only important for AST history. If the Deck of Sixty predates Sharlayan ASTrology, by existing in all the previous eras, then the images of the 6 major arcanum doesn't have to adhere with the constellation imagery. It would have similar parallels with the irl tarot history, where when hundreds of years the The Devil card depicted the traditional devil with no astrological sign connection, to the Rider Deck Devil Card with Baphomet depicted instead and with the astro sign Capricorn attached to it in recent times.
Second theory: The Lovers and The Sun card are alternative forms of two of the minor arcanum. This is the headcanon I'm using for card readings in-game. That way it doesn't conflict with the constellations lore. To be honest, the lore for the Deck of Sixty is all over the place, even the elemental heavens/hells are completely different order from the typical eorzean cycle, so I don't mind the irl major arcana became minor arcanums. Some irl tarot decks had illustrations in their pip deck. And Thoth deck had named minor arcana as well. If I'm following this logic, I would definitely place The Lovers as the Two of Irons card, since the irons suit is the actual Lover goddess's domain besides Halone. And it takes two to be eternally bonded. It's not perfect since the card depicts a heart, which is supposed to be associated with the cup suit, which also makes way more sense since that's the emotions suit, but the irons suit also better conveys the irony of the bittersweet aspects that being a lover has. The Sun has to be in Azeyma's staves suit for sure, it could be the Six of Staves, the last pip, to represent the completion and the happiness behind it (also 6.0 expansion), or Ace of Staves, since aces are the pure form of a suit, or it's beginning, like the dawn.
Third theory: Since this boss is a goddess of fate, she can create new cards outside of the Deck of Sixty to show she's above the AST law. But The Sun is heavily tied to Azeyma, it just doesn't make sense to have repeated themes