The Margrave — Catherine Fisher

Raffi knows he is being hunted even if Galen doesn't agree. Raffi also knows exactly what is after him, and it is too terrible to face, hidden in the deepest, darkest part of Anara -- the Pits of Maar. What Raffi doesn't know is what it wants.

The fate of Anara rests on Raffi facing his greatest fear in this thrilling and astonishing conclusion to the Relic Master series. Evil is unmasked, loyalty is tested, and the greatest secret in all of Anara is revealed.