The increasing tension in King's Landing on Game of Thrones is bound to come to a head in the Season 6 finale, "The Winds of Winter." Cersei, Loras, and Margaery's trials are finally upon them and that will mean huge things for all three characters; any and all of them could very easily end up dead if they're convicted. Margaery is currently the one in the best standing with the Faith because of how well she has seemingly duped the High Sparrow into thinking she's a true believer. It got her out of her walk of atonement, but will it be enough to save her at her trial? Will Margaery die?
Margaery's charges are light compared to those of her family members. She was arrested merely for being witness to Loras' alleged "crimes" and lying about it; basically, for being a good sister to a brother who hasn't actually done anything wrong. Cersei's the only one of the three up for serious crimes that she actually committed, but Cersei could also be the only one to escape unscathed. Rumor has it this will be a finale with a high body count and that the conclusion of the season will be an explosive one – literally.
There has been a lot of foreshadowing about Cersei pulling a majorly destructive stunt in the finale that could result in the deaths of nearly everyone: Margaery, Loras, the High Sparrow, and even Tommen. There are rumors in Westeros that Aerys, the Mad King, stored wildfire all over King's Landing with the intention of burning the city to the ground. He never got the chance because Jaime killed him before he could enact his plan, but all the wildfire is still there waiting to be set off. The show has brought this up enough times that it's suspicious and Cersei has definitely been looking into the truth of those claims. It could be her trump card, the trick up her sleeve: if the trial is going badly for her, Cersei could have the wildfire set off. It would destroy everything in its path and take out her enemies at the same time.
And Margaery might be caught in the blaze. Thanks to a line from Jaime way back in "Kissed by Fire," fans know that the Mad King kept wildfire under the Sept of Baelor, which is where the trial will take place. If Cersei blows the sept sky high then Margaery is definitely a goner. Actress Natalie Dormer has even hinted at the possibility that her time on the show is no longer. When asked by Vanity Fair about the protocol when a character is killed off, Dormer made it sound like she was personally familiar with the process.
'We normally get a phone call from Dan and David, the creators of the show,' Dormer explained of the actors who are let go from the show. Of our raised eyebrows at Dormer lumping herself into that group, the actress was quick to shoot her publicist, standing nearby a look and stress, 'My understanding is that there is homage paid that way . . . but that’s as far as the ritual goes from my understanding.'"
Dormer could just generally be lumping herself in with the rest of the cast in a show of solidarity, but the fact that Vanity Fair made a point of her looking to her publicist and correcting herself is certainly curious. There were no signs about Margaery's fate in the trailer for the upcoming episode, but that doesn't mean much; the show could just be saving the biggest moments for when the episode actually airs.
Though Margaery appears to be playing a long con by tricking the Sparrow into believing she's on his side and sending secret messages to her grandmother, it might not be enough to save her. There's no way she could predict Cersei's plan – if indeed setting off the wildfire is Cersei's plan – and that could spell disaster for all of the Tyrells.