As Winterfell prepares for the Army of the Dead to march on them, Melisandre approaches from the darkness. As the War of the Five Kings climaxed and devolved into disaster, Melisandre's faith began to crack. Davos asks which she is and she says that she is good. Looking forlorn at herself in the mirror, she takes off her necklace and her illusion of beauty disappears, revealing her true form: a frail old woman, many centuries old. After Selyse leaves, Melisandre inquires as to whether she will be left behind when Stannis marches on Winterfell; Stannis confirms that this time, she will come with him.Satisfied, Melisandre visits Jon Snow, offering a surprisingly mundane reason for him to join the battle: his familiarity with Winterfell's layout will provide a tactical advantage. She began to lose faith in Stannis as the Battle of Winterfell came closer at hand, but remained at his side for the most part; however, after the deaths of Shireen and Selyse (the latter of which Melisandre was partly responsible for), Melisandre fled the battle, perhaps in fear of Stannis's rage, and was unable to do anything to help Stannis crush the Boltons in battle, even though she claimed to Davos that she would have eased Stannis's victory at Blackwater.
Melisandre does not resent Davos for intending to kill her or for preventing her from sacrificing Edric Storm. GradeSaver, 25 January 2018 Web. Stannis is visibly shocked and disgusted by the suggestion, asking her if she has lost her mind. Even though Melisandre claimed to possess superior knowledge about the Lord of Light, she faced several incidents and outcomes which she proved unable to predict or even understand. She tries to convince him by saying that Stannis must be the undisputed king when the Stannis's demeanor remains unaltered, despite Melisandre's positivity; both of them ignorant of the desertion following Shireen's immolation.The next day, the temperature climbs and the snow melts rapidly, enough that the army can march at last. This was a surprising turn for Melisandre because she supported Stannis so strongly under the impression that he was the one true king that would defeat the great evil to come, only to transfer her faith to somebody else. She also frightened Davos with her own powers, especially by alluring him in anticipation for what he was about to see. Kingdom ruled by Arkël, the grandfather of Pelléas and Golaud. Her faith all but shattered (and probably fearing Stannis's wrath), Melisandre abandons Stannis, steals a horse and flees back to Castle Black. This was a power most likely bestowed to her by the R'hllor, in order for her to fulfill her great and divine purpose in the world. However, the cold is so intense that the fire from their arrows is quickly extinguished. Melisandre begins to conduct human sacrifices, ordering any of Stannis's remaining followers who spoke out against her or their dwindling cause to be burned alive as offerings to the Lord of Light. She had enchanted her ruby necklace with a powerful glamour, and she wore her necklace to give her a beautiful and youthful appearance, as opposed to her ancient and withered true self. However, Melisandre is as dismissive about Shireen's "heresy" as she always is, and assures Selyse that Shireen will be needed where they are going.