I'm on my lunatic run and I was wondering if the reinforcements in this chapter ( the ones inside the actual map not the mire sorcerers), appear after you cross through a certain point of the map or do they appear based on which turn you are?
I'm at that same part. It's based on turns. The first wave of reinforcements appears from the four staircases near the beginning on turn 5, and the next wave appears from the next set of four staircases on turn 6. After that I'm not quite certain, but I believe the next wave comes from the staircases at the very bottom, and after a bit there's another wave from the first staircases. There may also be a second wave from the middle staircases, but I've been planting my units on them to block off any potential reinforcements so that I won't have to worry about that.
Ruler of the Unknown Universe "Courage is the magic that turns dreams into reality." - Emil, ToS:DotNW