Spoilers below for the fourth episode of “House of the Dragon.” This week’s episode of “House of the Dragon” kills off Rhaenys (Eve Best), the most prominent character to die yet (and her dragon, Meleys). It also severely injured King Aegon (Tom Glynn-Carney).The “Game of Thrones” spinoff series is set around 200 years before the events of “Game of Thrones,” following a civil war in the Targaryen family. Rhaenyra (Emma D’Arcy) is the rightful Queen, but her half-brother Aegon (Glynn-Carney) usurped her throne.