WHAT IS VIOLET'S SECOND SIGNET IN FOURTH WING | ONYX STORM THEORIES, EMPYREAN SERIES | BOOKTUBE

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She did have a dream with her father, so maybe she can communicate with the dead through dreams and do other things through dreams? Adding that I think it's going to be something that would work with the story, so her being able to research information in dreams by talking to the dead would make for good storytelling and world building.