The Gate of the Feral Gods

 The Gate of the Feral Gods by Matt Dinniman, 589 pages.

This is the fourth book in the Dungeon Crawler Carl series, you can read my review of the first one here. After the crawlers started getting a little too unified at the end of the fourth floor, the powers-that-be decided that this floor they would be randomly split apart into hundreds of bubbles, each with four castles that must be defeated before anyone would be allowed to leave the bubble and meet up with anyone else. While less complicated than the train puzzles of the 4th floor, nothing is ever easy on Dungeon Crawler World, and Carl will have to rely on the low level and minimally confident people in the bubble with him to get out alive. 

I continue really enjoying watching this series build on itself. Each floor presents something similar enough to the rest of the series to be a satisfying continuation, while also being new and different enough to present really interesting problems. On top of that, events outside of the dungeon are becoming increasingly visible and relevant. I don't know if this is my favorite book in the series, it's a little simple compared to some of the others, but I still thoroughly enjoyed it.