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So, it shouldn't be a shock to anyone that he was able to withstand the direct blaze from Drogon's fire. And his immunity to fire doesn't have anything to do with a possible Targaryen lineage but rather everything to do with his magic. The only way to defeat him is with Valyrian steel, and that's just what Arya does.
After meeting Melisandre, she sneaks into the godswood and jumps on the Night King. He grabs her throat and the hand that is holding the Valyrian steel dagger, but she allows it to fall and quickly picks it up with her other hand. Arya then stabs the Night King, and he and his army disappear.
During the Massacre at Hardhome, White Walkers are shown to be resistant to fire due to the extreme cold they radiate, which snuffs out any flames in their vicinity.
The White Walkers were created by the Children of the Forest thousands of years ago as a form of protection against the First Men who were cutting their sacred trees and slaughtering their tribe.
All of that changed when Bran entered the picture as the Three-Eyed Raven. This introduction gave the Night King a true motive outside the typical megalomania of Big Bads. By wiping out the Three-Eyed Raven, he would be wiping out all memories of the previous world and fully ushering in his new era.
In Game of Thrones Season 8, Episode 2, just like the audience, Samwell Tarly asks Bran Stark why Night King wanted to kill the latter and what did he want. To this, Bran tells Sam that the king of the dead wanted 'an endless night'. He said, "He wants to erase this world. And I am its memory."
2. White Walkers are allergic to salt. This theory not only covers the idea of the Night King's army swimming across, but also why they don't use their magical winter abilities to freeze the water and walk across. And it's simple, really: White Walkers are allergic to salt.
Daenerys survived the flames when her dragons were born thanks to a mysterious, magical mix of Mirri Maz Duur, sacrifice, and dragon eggs.
And moving on to Jon, the Vlad said he really wanted to have a one-on-one battle with the King of the North because “Why not?” But then he realized that “in history, everywhere, kings never fight. I am a king, I have bodyguards. If I need to kill Jon Snow, there are 10 or 12 other White Walkers who can fight him.”
Longtime fans will surely remember Syrio Forel, the master sword fighter who was hired by Ned Stark to teach Arya how to use Needle, the sword that was given to her by half-brother Jon Snow. The lessons are kept a secret, with Arya's sister Sansa believing Syrio is a dance tutor.
Game of Thrones season 2 shockingly revealed that the Wilding Craster gave up his male children — born of incestuous relationships with his own daughters — as sacrifices to the Walkers in exchange for relative peace in the Haunted Forest.
No, the Night King is not a Targaryen.
In the books, however, the story of the Night King is slightly different. The Night King isn't the leader of the White Walkers. Instead, he's a legendary historical figure who supposedly betrayed the Night's Watch to marry a “corpse queen” and then crowned himself a king.
Game of Thrones' Drogon chose not to kill Jon Snow because of his Targaryen blood, his love for Daenerys, and Drogon's possible understanding that while Jon committed the act, he wasn't the reason for Daenerys' death at the end of Game of Thrones'.
Although many fans were hoping for a lot more explanation about the Night King and Bran Stark than we got, there was one subtle detail that confirmed the extent of Bran's powers as the Three-Eyed Raven. A scene from last season shows that Bran knew Arya would kill the Night King on Game of Thrones all along.
As Drogon turned his attention to the Iron Throne, he aimed his anger at the thing that took his mother's life — the seat of power. Sure, Jon may have physically killed Daenerys, but it was her pursuit of power that turned her into the Mad Queen and eventually led to her seemingly necessary demise.
But in the first of the “A Song of Ice and Fire” books on which the show is based, there's another line to Mirri's curse: “When your womb quickens again, and you bear a living child.” Essentially, the reason Daenerys thinks she can't have children is that Mirri cursed her, killed her baby and wrecked her husband.
During the first novel, Jon grabs a flaming curtain and throws it over a wight that's trying to kill the Lord Commander of the Night's Watch. This severely burns Jon's hand, an injury which bothers him throughout the entire rest of the book series as well as occasionally on the show.
According to the writer his intention was never to make the Targaryens fireproof. As reported in Men's Health he states: "Targaryens are not immune to fire! The birth of Dany's dragons was unique, magical, wondrous, a miracle.
The code of the Night's Watch is that one horn blow means another ranger is returning, two blows means enemies are coming and three blows means White Walkers are coming. When they hear three blows, the two night rangers flee, leaving poor Sam cowering behind a rock.
When Benjen said his good-byes to Bran and Meera in season six, he explained that he wasn't able to pass beyond the Wall because “ancient spells” and “strong magic” prevent the dead from crossing.
Benjen told Bran and Meera last season it's because ancient spells were carved into its foundation so the dead can't pass.
As the Three-Eyed Raven, Bran has the ability of greensight, which means he can see events in the past, present, and future through visions. Killing Bran would essentially erase all memory of mankind. Samwell Tarly explains it pretty well in the scene.
But did Bran actually foresee himself becoming king? When Tyrion Lannister asks him if he'll take the role, Bran answers, "Why do you think I came all this way?" implying that he probably knew what was coming.
In the book, Hodor has stolen one of the old swords from the crypt. Bran has been warging into Hodor and practicing with his body, because Bran had been trained in swordplay. So telling Hodor to “hold the door” is more like “hold this pass”—defend it when enemies are coming — and Hodor is fighting and killing them.