Either fight your way to the indicated point in Varajar Fells from Olafstead, or if you have the Central Transfer Chamber unlocked, you can just use it to go through the Battledepths, considerably cutting down the time of your journey. Watch out for the Shock Phantoms around the fighting area, as they can be especially deadly in combination with the Facet. The Facets from the Cipher quests will appear one at a time, thus it doesn't really deserve the Master difficulty tag and can be completed with heroes and henchmen.