During the Dance of the Dragons, she flies in Meleys during the battle of Rook's Rest and fights against Aegon II and Aemond (who are also on dragons). Meleys, Rhaenys's dragon, dies, and Rhaenys is believed to die with her—but her body was never identified.
As Joffrey tells us, eventually, Rhaenyra's half-brother Aegon Targaryen will feed her to his dragon Sunfyre. She dies as her son, Aegon III, watches. That's the bullet point version. Of course, there's a lot that happens between the end of House of the Dragon season 1 and Rhaenyra's death.
Syrax was slain in the aftermath of the Storming of the Dragonpit.
Things only get worse when Aegon straight-up has his dragon Sunfyre kill and eat Rhaenyra—in front of her last remaining child Prince Aegon the Younger.
After escaping her room with the help of defected knight Erryk Cargyll, Rhaenys finds herself swept up in Prince Aegon's coronation ceremony. She slinks away as Aegon receives the Conqueror's crown, managing to descend beneath the floorboards and reunite with her red-hued she-dragon Meleys.
They also killed Rhaenyra's own dragon Syrax, shortly thereafter. Having already lost her first three sons to the war, Rhaenyra fled back to Dragonstone for safety.
With both Rhaenyra and Aegon gone, there's one clear person to inherit the throne: Rhaenyra's son Aegon, known as “Aegon the younger” in the books (her older sons had all died by this point).
Prosthetic designer confirms: the baby was deformed
“When the babe at last came forth, she proved indeed a monster: a stillborn girl, twisted and malformed, with a hole in her chest where her heart should have been and a stubby, scaled tail.
Murder of Laenor Velaryon
All accounts agree that Laenor Velaryon was personally stabbed to death by his lover, Ser Qarl Correy, while attending a fair in Spicetown on Driftmark. The two men had been loudly arguing in public beforehand.
Visenya also took Vhagar across Westeros to put down any rebellion, and Vhagar burned down the strongholds of five houses in the Riverlands in a single night. Maegor's reign of cruelty would continue, but Visenya would die in 44 AC (After Conquest), leaving Vhagar without a rider.
Dreamfyre laid a lot of eggs in her time, including three that were stolen from Rhaena by a woman named Elissa Farman. No confirmation, but there's a theory that these three stolen eggs are the ones that ended up in Daenerys Targaryen's hands, later becoming Drogon, Viserion, and Rhaegal!
He returns with three eggs in total. Syrax is able to feel the pain of Rhaenyra when the latter miscarried her daughter Visenya.
After Daemon's first wife dies, he gets together with Laena Velaryon—who was initially suggested as a bride for King Viserys. They have two daughters. Meanwhile, Rhaenyra marries Laena's brother, Laenor Velaryon, and they have several kids. We watched all that happen in last week's time-jump episode.
Rhaenyra Targaryen is killed by her half-brother Aegon II Targaryen when he cruelly feeds her to his dragon Sunfyre.
As Joffrey puts it (a bit too gleefully), Rhaenyra is murdered by her brother's dragon. “It ate her while her son watched," he explains with a grin. "What's left of her is buried in the crypts right down there.”
Sunfyre devoured Rhaenyra in six bites, leaving only her left leg below the shin. Prince Aegon the Younger was forced to watch his mother die, and Elinda Massey allegedly gouged out her eyes in horror.
Rhaenyra Targaryen is killed by her half-brother Aegon II Targaryen when he cruelly feeds her to his dragon Sunfyre. Don't worry, Aegon II and the Greens don't win the war, though the Blacks ultimately triumph and put Rhaenyra's son Aegon the Younger on the throne.
Her mother is Rhaenys Targaryen (Eve Best), the queen who never was, elder cousin to King Viserys and so by blood she is also a Targaryen. Yet Laena commands her dragon to engulf her in flames knowing that the act would kill her, which means even she was privy to the fact that she was not immune to fire.
Aegon II sentenced Rhaenyra to death by dragon. In front of all the assembled courtiers, he fed his older half-sister to Sunfyre, who breathed fire on her before devouring her remains. That was the end of Rhaenyra's life, but as fans may get to see on the show, not the end of the war.
In the book, Visenya was described as being born with dragon-like defects, including scales, a tail, and a twisted body. Rhaenyra's baby did end up having scale-like defects and a malformed body in House of the Dragon, which aligns with the occasional reports of Targaryen women bearing dragon-like stillborn children.
When finally did give birth to the baby, it is said that the child had a hole where her heart should have been, a tail, and scales for skin—a monster, as her mother had cursed her to be. Upon her death, Rhaenyra swore yet another vow.
Rhaenyra's three eldest sons all died fighting during the Dance of the Dragons, but her two youngest sons, the sons by her second husband, Prince Daemon, survived the civil war.
It was only after his dismissal that Otto's diplomatic efforts bore fruit. Just as he had predicted, Otto was the first to be beheaded as a traitor by Rhaenyra after the fall of King's Landing in 130 AC.
Eventually, it's Daemon and Rhaenyra's two sons who end up sitting on the Iron Throne, but is that for a future series? The Velaryons survive, but in recent years Ser Corlys has come to support the Greens, after falling out with Rhaenyra and being accused of treason (unfairly).
After conquering all but two of the islands, Daemon declared himself King of the Stepstones and the Narrow Sea in 109 AC, being crowned by Corlys the Sea Snake.