For years, Fire & Blood readers believed they already knew how Sunfyre’s story would end. But House of the Dragon Season 3 has suddenly torched one of the saga’s biggest assumptions, leaving fans wondering whether Aegon’s legendary dragon is truly alive or dead. And if that is true, the biggest casualty may not be Sunfyre alone.

But is Sunfyre really dead? Here is everything you need to know about House of the Dragon season 3.

House of the Dragon Season 3, Episode 4 finally puts months of fan speculation to rest by confirming that Sunfyre is, in fact, dead. While fleeing with Larys Strong, Aegon returns to Rook’s Rest, where he finds his dragon’s lifeless body after earlier reports suggested the once-glorious beast had been slowly wasting away. Refusing to let go, Aegon insists he can still feel life within Sunfyre before taking one of the dragon’s golden scales as a final keepsake.

The confirmation marks one of HBO’s biggest departures yet from George R.R. Martin’s Fire & Blood. In the book, Sunfyre survives the Battle of Rook’s Rest despite devastating injuries, eventually recovering enough to play a pivotal role in one of the Dance of the Dragons’ most heartbreaking moments. By ending the dragon’s journey here, the series has suddenly thrown one of its biggest future storylines into complete uncertainty.

Who Is Joffrey Targaryen in 'House of the Dragon?' The Truth Behind the Confusion

Turns out, Sunfyre may not be the only casualty. HBO might have quietly torched one of the biggest moments waiting at the end of the Dance of the Dragons.

In Fire & Blood, Sunfyre survives the Battle of Rook’s Rest despite suffering horrific injuries and slowly regains enough strength to fly again. That survival becomes one of the story’s most devastating turning points after Rhaenyra flees King’s Landing, only to be captured and brought before Aegon, who orders his scarred dragon to burn and devour her in one of the Targaryen civil war’s most haunting moments. If Sunfyre is truly gone in HBO’s adaptation, that entire sequence can no longer unfold the way George R.R. Martin originally wrote it.

That does not necessarily mean Rhaenyra escapes her fate. Game of Thrones already established that Aegon’s dragon ultimately kills her, leaving House of the Dragon with the challenge of reaching the same destination through a different path. Whether Sunfyre somehow survives as an elaborate fake-out or Aegon eventually bonds with another dragon, such as the legendary Cannibal, HBO has now opened the door to one of the show’s biggest mysteries heading into its final season.

And with Sunfyre seemingly out of the picture, House of the Dragon has quietly turned its biggest ending into its biggest mystery.

Steve Toussaint Teases Fallout After Corlys Challenges Rhaenyra’s Authority in 'House of the Dragon' Season 3

Should House of the Dragon stay faithful to Fire & Blood, or do you enjoy HBO’s major story changes? Let us know in the comments.