The Field Manual of the Shadow Seeker (Manual de Campo del Buscador de Sombras) is a book of the New World, found in the cabin of the tracker Sasha.
It helps the reader understand that there is more than the obvious, serving as a guide to perceiving the hidden dimensions, the shadows and the entities that operate behind visible reality.
Spanish entry: Manual de Campo del Buscador de Sombras (Mundo Nuevo)