Spoilers for the whole series. The overview is spoiler free; facts that give away later events stay folded under the book that reveals them.
Cadet in the Riders Quadrant, introduced in Fourth Wing
Rhiannon Matthias is introduced in Fourth Wing, the first book of the Empyrean series. She is a cadet at Basgiath War College, in its Riders Quadrant. Her friendship with Violet, her dragon, her family and what the guides record from Iron Flame are spoilers, so they sit in folded sections below, grouped by the book that reveals them. Each line names the fan guides, at least two, that agree on it.
Rhiannon first appears in Fourth Wing, book one of the series.
No spoilers Listed by theBookFeed and Esta Pinto (both opened Oct 14, 2026)
Rhiannon is a cadet at Basgiath War College, in its Riders Quadrant.
No spoilers Listed by theBookFeed and Empyrean Riders (both opened Oct 14, 2026)
She is one of Violet Sorrengail's close friends.
Spoilers through Fourth Wing Listed by Empyrean Riders and theBookFeed (both opened Oct 14, 2026)
Her dragon is Feirge.
Spoilers through Fourth Wing Listed by theBookFeed, Empyrean Riders and Esta Pinto (all opened Oct 14, 2026)
In Iron Flame she becomes the leader of her squad.
Spoilers through Iron Flame Listed by theBookFeed and Empyrean Riders (both opened Oct 14, 2026)
She has a sister named Raegan.
Spoilers for the whole series Listed by theBookFeed and Empyrean Riders (both opened Oct 14, 2026)
These facts come from unofficial fan guides, not the author or the publisher. A fact is shown only when two sites with different owners state the same thing; we write every sentence ourselves and quote nothing.