This post contains spoilers for Fourth Wing by Rebecca Yarros. Please do not spoil this amazing book for yourself by reading this theory.
To start: If we look at the cover for Fourth Wing, there are two dragons (A golden dragon in the center and a black dragon around the edge.) As first time readers, we did not see this major foreshadowing. Once we have read Fourth Wing, however, we know that these are depictions of Andarna and Tairn. We also know that Mrs. Rebecca Yarros is amazing at telling us major details in a way we completely over look it. (I.e. Dain's ability to read recent memories...)
Slight topic change: What could Violets second signet be? Personally, I do believe Violet will be getting a second signet that she channels from Andarna. There has been a lot of thoughts and theories regarding what Violet's second signet might be. My favorite theory is from Fantasy Fangirls Podcast: Violet's second signet will be offensive, since her first is defense.
Using all this information, I think that Violet's second signet will be light wielding, or something similar. If we look at the cover of Iron Flame, we again see Andarna in the center. This time, however, she is surrounded by rays of sun. In Fourth Wing, Andarna tells Violet that nature likes all things in balance (I am unsure of page number.) The harmony between Xaden wielding shadows and Violet wielding light is a beautiful image, and it would keep everything in balance. I feel that Violet would not be able to do much defensively with this ability, it would be more offense. For example, she would be able to shine a bright light to allow the rebellion to get closer to the other front line without the enemy being able to see. (Extra points if Xaden used his shadows to cover the rebellion within the light!)
I am just a girl that has a major obsession with this book. I am grasping at straws, I know, but let me know your thoughts! This isn't a theory I have seen anywhere else, so I wanted to share.
Also! Check out Fantasy Fangirls Podcast at https://youtube.com/@fantasyfangirls?si=-tVrQBm3Z0CQBLwr or on Apple Podcast or Spotify for FREE.
