OMG YOU DEFEATED ROYAL RAT AUTHORITY!
I think I should start by apologizing to Dark Souls 2 for doubting their ability to bring it. After the disappointing fights with The Old Iron King and The Rotten I was starting to worry that the game was getting too soft. The Royal Rat Authority went the distance and proved itself to be a challenging fight.
Whatever you think of the boss in a normal game does not apply to the Company of Champions. I died 5 times in the blink of an eye during the initial boss rush. Too many rats to dodge at once and the boss rat just smashes everyone (rats included) with it's initial strikes. I only have 4 dodges before my stamina is completed depleted and the rat boss combo consists of 3 strikes. That leaves me with 1 dodge and no stamina to try to avoid the other rats that will toxic you to death and probably kill you with normal hits.
The game actually forced me to leave the Company of Champions for a moment to see what the boss was like in a normal game. It actually allowed me to kill its little buddies so I as finally able to test out its moveset. The Rat Authority is actually very similar to Sif in the way it dodges out of the way of attacks. I was able to figure out its two paw sweeps, but the head bash was tricky as hell. I left/allowed myself to die once I had enough of his moves. I would figure out my offensive strategy against the Company of Champions version because the normal version was too docile.
I came back in with a new strategy. The little rats need to die before I engage the big one because I don't have enough stamina to dodge/fight them all without the big one taking me out. I only managed to kill all the little ones with my Uchigatana once, but it wasn't reliable enough. I settled on landing a single arrow kill and then killing the rest of them with a single Firestorm as they rushed me. I barely had enough time after the cast to dodge the incoming Rat Authority combo.
I believe I died a total of 10 times (boss could kill me in 2 hits with any combination of attack) before I finally saw through his Head Bash attack. I literally yelled "I got your number bitch!" the first time I dodged it because that was the only thing that was stopping my victory. I had the timing down so it was just a matter of patience and execution as I whittled him down to his weakened vomit state. I killed him during the same fight that I learned his final move so I'm pretty stoked about that.
I know this boss was good because my hands were shaking after he went down. If a boss doesn't make my hands shake then it wasn't challenging enough.
Now I'm off to who knows where because I've cleared every area I've been to (saw the castle earlier, but I was told to go back so I did).