Tons of things big and small were changed by the time the credits rolled on the penultimate season, that a full running list could prove taxing. But it’s worthwhile to track the largest changes that could have ripples leading into Season 4 of “House of the Dragon. These are the biggest changes in “House of the Dragon” Season 3. That happens at the end of Season 2 but her Season 3 arc is wildly different. Helaena’s DeathThis is the one Martin seemed most concerned about following his blow-up about Season 2 back in 2024.