The House of the Dragon finale is going to feature a major, tragic moment from the book

gamesradar.com:

The House of the Dragon finale is almost upon us. Episode 9 saw Aegon Targaryen crowned king as the greens successfully usurped the throne, but from the finale's trailer, it looks like Rhaenyra is ready to fight for her birthright. 

The trailer also reveals a major, tragic moment from the book will be brought to screen in episode 10 – and we're delving deep into what goes down in George R.R. Martin's Fire and Blood below. So, be warned that there are major spoilers for the book and most likely the finale ahead. Turn back now if you don't want to read them! 

Still here? Then let's dig into those spoilers. In the trailer, we see Rhaenyra's son Lucerys Velaryon atop his dragon Arrax, riding on a dark and rainy night. Ominously, Vhagar, the oldest and biggest of the dragons, can also be seen in the vicinity: and she's ridden by Aemond Targaryen, Luke's uncle and Aegon's younger brother. 

This isn't going to be a happy family reunion, though. Cast your mind back to House of the Dragon episode 8, and you'll remember Aemond getting particularly annoyed when Luke laughed at a pig on the table, harking back to the Targaryen and Velaryon kids taunting Aemond with a winged pig when he didn't yet have a dragon. This spurred Aemond into standing up and calling his nephews strong, not-so-subtly naming them bastards as the sons of Harwin Strong. 

That set-ups a rivalry between uncle and nephew which, in the book, comes to a head over Storm's End, the seat of House Baratheon. Luke travels there as an envoy for his mother after promising her he wouldn't participate in any fighting. Aemond and Vhagar are already there, and Aemond tries to pull his young nephew into a fight by drawing his sword. Luke is committed to his peaceful task and