Under City
According to the paths, this was the last chapter of the DLC. It was basically some kind of underground city with a lot of construction sites and trains. What's most interesting about it is the return of the granny.
The chapter started with us in a subway structure, which then led to a sequence filled with Bridges and Cranes.
This one is very interesting. It mentions our approach to a dam. Why is this interesting? Because the huge wall in LN3's Necropolis is probably a dam as well. Judging by the nets with fish on them and the fact that there's a literal ship in the middle of the desert, it suggests there was probably water.
There were a LOT of bridges in this chapter and a lot of machines too. But there's also a lot of mentioning towards a Hub.
The most interesting part in this chapter was the mention of a Granny. Judging by how it had a bunch of water puzzles, and even one involving baiting the "granny", makes me think this was the same one from LN1.
(yes, that's it. The entire chapter, based on what was written, was just a bunch of bridges, subways, puzzles, granny scenes and walking)