Ser Arryk and Ser Erryk were both sworn members of the Kingsguard, but now the twins find themselves on opposing sides: Arryk serves King Aegon II Targaryen, while Erryk is loyal to Queen Rhaenyra. There are several warring factions and familial divides, but one of the biggest splits comes with the Cargyll twins. House Clegane may not have a major role to play in House of the Dragon season 2, but the show can do something similar. However, it didn't happen until right before Game of Thrones' ending, and it resulted in both brothers perishing. Thanks to a popular theory among book readers in particular, there was an expectation to 'get hype' (as the common refrain went) for Cleganebowl. Through much of Game of Thrones' run, audiences were hoping to see the Clegane brothers have a proper fight after a brief altercation in season 1.
House of the Dragon season 2 will see two characters fight it out in what will essentially be its own take on Cleganebowl, the clash between Sandor 'The Hound' Clegane and Gregor 'The Mountain' Clegane from Game of Thrones season 8.