In the 6th book of the Night Watch cycle, the story its much about the "sixth watch", a mysterious group of people. They consist of representants of six different parties, namely: Vampires, Light, Darkness, witches, a prophet and a mirror.
At the end of the book, Anton Gorodezki announces the members of the sixth watch, shortly before the twilight-god enters the room. They consist of Arina (witch), Nadya Gorodezki (light), Kescha (prophet), Egor (mirror), Zabulon (dark), and surprisingly Kostya (vampire).
The last part seems a little "rushed", since everything happens pretty quickly without much explanation. One requirement for the members of the sixth watch is also, that they are connected by blood. This is the tricky part I don't quite understood.
The members are seemingly connected via Anton. Nadya: Anton's daughter Zabulon: Anton's grandfather Egor: Got some of Anton's blood in the first book Kescha: Connected to Nadya by a blood oath, and thus connected via Anton Kostya: ??? I was still surprised that he's alive Arina: She says multiple times that she has no connection to Zabulon or Anton or anyone else
So, how are they all connected, especially the last two?