Even though the final season premiere isn't until 2019, potential Game of Thrones Season 8 spoilers are already rolling in — and from an interesting source indeed. According to Winter is Coming, the DVD commentary for Season 7 drops a major hint about what's to come for Cersei's impressive map room. It seems the set was purposely designed as a courtyard with no ceiling for reasons still to come. If the prophetic vision that Daenerys has in Season 2 is any indication, then that reason is most likely dragons.
As reported by Mashable, VFX producer Steve Kullback reveals he and his team were following directions from the very top. Reportedly, series creators David Benioff and Dan Weiss had specific instructions for the map room that included it being visible to the sky. In the commentary, Kullback said that Benioff and Weiss "asked us to make [the map room] an exterior location in an upcoming episode, but I can't tell you why... But that'll pay off."
Could that pay off involve the show finally showing the Red Keep ravaged by fire and ice as it is in Daenerys' vision? Just in case you need a refresher, in Season 2, Daenerys ventures into the House of the Undying in order to get her dragons back, but she's distracted when she finds herself in the throne room in King's Landing. In the vision, the throne room has seen better days. It looks as if fire has destroyed the castle, which has allowed snow to cover everything, including the Iron Throne.
The imagery of the ravaged throne room recurs in Bran's Season 4 vision, but there's an important addition — Bran also sees the shadow of dragon wings flying over King's Landing. That shadow could be the reason why Cersei's map room needs to be roofless, because it will give her the perfect view for when dragons arrive in her city. No matter what happens next, Bran's prophecy and Daenerys' are clearly linked, and the implication seems to be that a dragon is responsible for the damage. In the aftermath of Season 7, the big question is which dragon?
Now that the Night King is in possession of Viserion, he's already begun cutting a path of destruction through Westeros. In the Season 7 finale, Viserion destroys the Wall, so it's entirely possible that he's responsible for the future destruction of the Red Keep as well. However, there's a far more devastating potential explanation for the castle being left in ruins.
After the events of the finale, the Night King and his army are marching North first. The fall of Winterfell feels inevitable, and it's likely that the Riverlands will be overtaken as well. If the characters are going to make a last stand in Season 8, there's no better place for that to happen than King's Landing. Furthermore, there's just no way the show is going to end without featuring a dragon versus dragon battle.
If Daenerys, Jon, and the others are left to defend King's Landing against the Night King, then you can bet that Drogon and Rhaegal will be pitted against Viserion. The ensuing damage of such a fight would inevitably leave most of the castle destroyed, but it could also be the only option the characters have as they attempt to stop the white walkers from taking over the whole of the Seven Kingdoms.
While the shadow of dragon wings over the city has always felt dangerous, that imagery could in fact be a sign that the cavalry has arrived. If it's Viserion's shadow, then obviously that's bad news, but if it's Drogon or Rhaegal's then it could mean that there's hope for King's Landing yet.
The reason that Cersei's map room needs to be visible to the sky will be revealed before the series ends, but for now, there's no harm in speculating that it could be a major hint about the show's final battle.