Blue lanterns?

Blue Light: A member who intends to join the underworld without holding a ceremony only needs to express his loyalty to the society at first, but once he joins the society, it means that he has died before, and he will be "reincarnated as a human being" when he holds the initiation ceremony on an auspicious day. Traditionally, China people hang blue lanterns outside their houses after death, so the full name of "blue lanterns" is "hanging blue lanterns".

Reference: I 611/discuz/viewthread? tid= 1 170 - 22k

Blue lantern? It seems to describe the newcomers who just entered the black X club, that is, the lowest level.

Police car lights! ! blue

Tie the lantern to death.