31. The eagle of the Highlands

Monks writing a book about the history of Loch Castle's Abbey are looking for clues about an eagle that would have hunted the place in the 13th century.
The eagle is said to have been destroyed, or, according to another version, was kidnapped by two demons coming from some sort of egg with arms moving in a spirale of light...
What is that eagle? What's its relation with Zarkā? But also why does Brigit wants to see Yoko?