After receiving this task, I immediately went to the Arcane Hall of Dongbao College according to the prompt, found the lost legend, and read it out to trigger the follow-up task.
Brief introduction to the blood stone holy grail of the ancient scrolls 5
Talk to Garland near the main hall, follow him into a room, and let you take the holy grail of blood stone to the red water wooden house, which is filled with the fountain of blood. Then, add the blood of powerful vampires. Come to the red water cabin. There is a hatch in this abandoned house that leads to the underground hotel. It's full of people controlled by drugs.
Enter the basement, come to an empty hall, get rid of all vampires here, investigate a vampire with a name, get the key to the red fountain, and use it to open a master iron gate opposite. Of course, you can also pry the lock open.
Find the red water fountain inside, filled with the holy grail of blood stone. Then there will be two vampire masters, kill them and add their blood to the holy grail.