Wuxia Crossover: My Golden Core Shatters the Four Kingdoms, and I Become a Marquis Above Them All

After cultivating immortality for three hundred years, I died in a great calamity and transmigrated into the Anshun Marquis's residence, on the border between four kingdoms. My fever broke and I awoke, but the cracks in my Golden Core were still there. An eighteen-year-old body, a three-hundred-year-old mind: in this turmoil among the four kingdoms, I’m calling the shots.