This hub is basically divided into three main parts. After exploring this level, you need to fill in the missing gems into the astrological chart (they are scattered through the levels, the Orchard of Lamentations and the Silent Refectory). When the map is completed, the way opens to the second puzzle, the puzzle of the three chapels: wolf, dragon and griffin. There you have a total of nine switches to pull in order to get to the final part of this hub, that is defeating the Heresiarch.