Book four of the Dungeon Crawler Carl series. Carl, Donut, and Katia get to the next level, get into more trouble, get additional skills and levels, and figure more things out. This level has the crawlers divided up into separate domes with different circular quadrants. Also, there's getting to be a little more about the underlying factions and politics of the universe as the serious progresses. As before, if you liked the prior books, you'll probably like this one.