The True Goal?

Chi Shuyan shook her head and wasn't in a hurry to reply to Father Wei. She said, "When a black magic user starts cultivating a Flying Head, they usually have to find a secluded place to make sure that they won't be interrupted suddenly; the Flying Head can only come out at midnight. The Flying Head is divided into seven stages, and each stage lasts for 49 days before it can be considered a success. Once a black magic user starts cultivating a Flying Head, they have to do so for the full 49 days without interruption, and they have to suck blood every day."