The clues for the trench coat guy being the rat king actually does make sense, you just have to pay attention to literally everything. Mainly the call before that said he was in disguise, the Rat King's description of trying to communicate with humans, and the Cat scratching at the door, as the cat knew that the Mouse King was a bundle of Mice, and was trying to get to them
Man I also got cooked on this one, some people said the base game was too easy so they said they had something for them. I was at 26% when I got to the christmas party. Like roshi, I kept getting cooked by that annoying ass mountain warlock and avalance mix up