I Work as a Tomb Keeper in Guigu Valley

On the day my grandpa died, I was told in a dream that our family has been "mausoleum keepers" for generations. I thought he was talking nonsense until I was sorting through his belongings and found the "Mausoleum Book" covered in animal skin. Turning to the first page, there was a structural diagram of my old house, with underground secret passages crisscrossing it like a maze. Following the diagram, I lifted up the stone slab under the stove, lit a torch and stepped into the darkness. At the end of the secret passage is not a treasure, but a corpse that has not decayed for thousands of years, dressed in the clothes of a northern sect's tomb robbers. The corpse held a scroll of silk book in its hand: "Ghost Valley in Jiuyi Mountain, once you go there, you never come back." That night, all the livestock in the village screamed at the same time, and the well water flowed back like blood. I know there are some secrets and it's time to reveal them.