Why is Fufang Moon on the earth called Black Tail?

Title of the role. Diablo is a role-playing web game developed by Wuxi Qiku Network Technology Co., Ltd., which was released on 20 13 13125 October. Fu Fuyue is a character in this game, and the black tail on the earth is the title that this character won by defeating countless enemies, and the winner of this title often has supreme power.