Chapter 37
Chapter 37 — "South"
TL;DR: Spring breaks; Darrow leads the Oathbreakers south out of the Northwoods toward the inhabited Institute valleys, intending to pick off the weakened Houses one at a time on his terms, not theirs.

Summary: The Oathbreakers march south. The chapter is movement and reconnaissance: long pine-and-snow descents, river crossings, signal-fire networks, Sevro's scouts running ahead like an inverted pack. Mustang's intelligence map has the Houses ranked by current strength: House Apollo has been quietly amassing power and is the hinge piece; the Jackal's Pluto is the deepest danger but also the most isolated; Cassius's Mars-and-Bellona alliance is mobile and dangerous. Darrow's plan is asymmetric: take Apollo while it still thinks the wildlands are full of refugees; do it before any other House can join the defense. The chapter ends on a ridgeline with the Apollo basin spread below, watch-fires of an unsuspecting House visible in the dusk.
Key scenes:
- Pine-descent at dawn — column moving down a snow-melt slope.
- A river crossing — pegasi swimming, Oathbreakers riding their backs, Sevro grinning with a knife in his teeth.
- A signal-fire chain across two ridgelines — the Oathbreakers' communication net.
- The final ridgeline at dusk: the Apollo basin below, watch-fires lit, no idea what is coming.
Characters present: Darrow, Mustang, Sevro, Roque, the Oathbreaker army.
Locations / settings:
- Northwoods-to-southern-Institute transition: pine descent, snow-melt streams, mossy lower forest.
- A river crossing — wide, stone-bedded, low spring sun.
- A high ridgeline at dusk over the Apollo basin.
Visual motifs: column descending out of pine into spring green; pegasi shoulder-deep in river water; a signal-fire chain glowing across distant ridges; Apollo's watch-fires in dusk in a basin below.
Emotional tone: purposeful movement, predatory anticipation, the held breath before a strike.
Confidence: medium — the south-march is summarized in recap sources at the act level; specific geography interpolated within plausible bounds.