History books always downplay the truth.
Chapter 17 of the third volume of "The General History of the Seven Kingdoms" records this: "In the 300th year of the Red Moon Calendar, at the end of the third red moon period, the Allied Forces of the Seven Kingdoms defeated the White Walkers beyond the Wall at the Wall of Sighs and signed the Treaty of Eternal Night. For the next thirty years, the mainland was peaceful."
But deep in the secret archives of the Harvet family, a noble family in the north, there is a faded parchment manuscript, which adds in the long-forbidden ash script: "The commander of the coalition forces, the 'Wise King' Robert I, used his own blood as a sacrifice to sacrifice a certain person under the 'Wall of Sighs'. The existence is sealed back into sleep. The price: The direct bloodline of the royal family will bear the "blood thirsty curse" from generation to generation. Every red moon night, they must drink the blood of living people, otherwise their bodies will rot and die. This secret is passed down orally by the heads of the seven major families and the archbishop. "
The last line of the manuscript trembled: "But the seal is loosening. Astrologers have observed that the next red moon period will arrive three years earlier. By then, what is under the wall will wake up, and Robert's blood will be as thin as morning mist."