Note: While the area is accessible to all vocations, it is highly recommended to only hunt here if you are a paladin.
The Inner Sanctum of Razachai is the deepest parts of northern Zao, where the Emperor keeps his finest guards as well as four of his own clones, each representing an aspect of his personality.
It is recommended that you bring Energy Wall and Bomb Runes to cut off the area in case you get swarmed. If not, prepare to have to fight up to 20 creatures in a row before you can catch your breath. Also Hatebreeder, one of the Ghastly Dragon bosses, appears here.