She is told by the Seelie Queen that she has the ability to create runes that don't exist, which later enables her to destroy Valentine's ship using the "Open" rune.
She has the ability to create runes. This was what she is told by the Seelie Queen. These runes don't exist. Runes enables her to destroy Valentine's ship using the "Open" rune. These Runes don't exist later.