Древнеславянская книга мёртвых

This book tells about the secret knowledge of the Slavic sorcerers. About the Nav world, the afterlife. About the queen of Navi, Marena, about the dark face (shadow) of Veles — the Grey Sea. About other rulers of Navi — Marena's son Bogumir, as well as about Oberon — the king of dark elves.

In the second part of the book, the beginning of the legends from the cycle "Deeds of Bus Belojar" is given. Prince Bus travels the Path of the Dead twice, and at the beginning of his journey, fate brings him to Mertsana, the embodiment of Marena. Then Marena bestows Bus with Immortality.