The House of the Masks
The House of the Masks is the House of the Chosen that transcends all the rest because it is from within it that a Candidate is elected to become God Emperor. As a consequence, the members of the House of the Masks have the purest blood of all the Chosen. It is the House of the Masks that constitutes the Imperial Power, one of the Three Powers. The Great Balance forbids that anyone of the House of the Masks ever to leave the Isle that lies within the Skymere lake within Osrakum