The Royal Rat Authority is a massive Dog Rat and servant of the noble Rat King. It resides in the Doors of Pharros outside the Rat King’s chamber. Those who choose to serve the Rat King must have the courage to face the Royal Rat Authority in combat. If one defeats the Royal Rat Authority, they will gain a Rat Tail and therefore the right to serve under the Rat King.
The Royal Rat Authority’s soul description states that it is a “living statue”. The Corpse Rats (Hunting Rats) serving under the Rat King inflict petrification, as do the Dog Rats. According to an old local legend, a great spear was used to defeat Santier, the walking statue. Perhaps it was that Santier too was one of the Rat King’s subjects, defeated by one who would seek the right to serve. The Rat King himself confirms that there was “a human who was once among us”, so perhaps we are not the first to kill a living statue and earn the right to serve this eminent being.
This boss can be difficult if you do not eliminate the Dog Rats that are a good distance from the entrance to the boss room. A bow is recommended, but long rang spells can also do the job. Essentially, there is a reason the bonfire is right before the entrance.