The Wind and Clouds of Chang'an

In the 23rd year of Zhenguan of the Tang Dynasty, on the eve of the Lantern Festival, undercurrents surged in Chang'an. During his night patrol, Lu Lingfeng, the Vice Minister of the Dali Temple, encountered a blood-soaked messenger galloping from the west of the city. Before dying, the messenger thrust a jade token engraved with the characters 'Xuanming' into his hand. Behind the token lay the mystery of the thousand-year underground palace left by the former national preceptor Xuanming Zhenren, and it also implicated the truth of the death of Lu Lingfeng's father, Lu Chengqing, who died in prison eight years ago—it was not an illness but a meticulously planned murder. The evil sect Xuan Yin Pavilion infiltrated Chang'an, and its leader, Black Fiend, practiced the evil art 'Nine Nether Xuan Yin Skill', intending to assassinate the emperor at the grand sacrificial ceremony, seize the jade token, and activate the Yin Gathering Array deep in the underground palace. Once the array was activated, a million lives in Chang'an would become sacrifices. Lu Lingfeng, along with his junior sister Su Qinghan and his master Xiao Yichen, joined forces with Pei Yuanzhao, the head of the Dali Temple, to break through three strongholds of the Xuan Yin Pavilion within six days and engage in a decisive battle at the southern suburb altar. However, the death of Black Fiend was not the end. From Chang'an to the Western Regions, from the Qilian Mountains to the Kunlun Peaks, a thousand-year sealing war unfolded. In this journey concerning the survival of the world, Lu Lingfeng and Su Qinghan walked side by side, from childhood sweethearts to life-and-death companions, fulfilling the oath 'As long as the blade is present, the loyal soul remains' throughout their lives. — Description from novelcodex.org