WotR‘s fourth chapter is the equivalent of Baldur’s Gate II‘s visit to the Underdark. You leave the kingdom management behind for a more standard RPG experience in a tiered cityscape.
Size-wise it’s about the same as the Prologue combined with Chapter I, and stands out mostly for some prominent difficulty spikes. You’ll have streetside encounters with spell-happy or insanely overleveled demons and quest-related encounters with overbuffed enemy after overbuffed enemy. It’s pretty unpleasant all things considered.
The other main feature of this chapter is the actual area itself. Instead of having a static map the buildings will change position based on which way your camera is rotated. Personally I thought this was pretty cool, but there are more than a few who seem to find it infuriating. More unambiguously annoying is that the game expects you at this point to have someone who can repeatedly cast Dimension Door to reach all the otherwise inaccessible rooftops. Usually you’ll find loot (often pretty damn good loot), though in one case there’s a battle with random enemies and in another there’s a superboss.
Honestly I found the entire experience draining and can’t wait to get back the world map so I can start moving my armies around again.