Each corridor established in the Expansion Arc adds a Web thread to the Ley Line network. The thread count at arc's end brings the network toward the 31 D Coale will confirm as sufficient for the New Compact.
Book 7
Tensaw Delta
Alabama · Southern Network
The first corridor outside the Appalachian range proper. The Atlantic coastal Web thread connecting the eastern range to the Gulf Coast system.
The southern network's documentary anchor. The delta's specific geography — where freshwater meets saltwater, the crossroads quality — gives the corridor a frequency that conducts the Web's lateral connections across environmental boundaries.
Book 8
Virginia Corridor
Virginia · Appalachian Northern Range
Still within Morvael's dissolved range — now the compact's Web thread. The Virginia thread connects the Pike County primary to the northern Appalachian network.
The temporal-frequency monitoring established here makes the corridor's history readable in both directions. The first evidence that the Appalachian system's geological record is legible to human practitioners.
⟡ Warden connection: Morvael's dissolved position holds this thread
Book 9
Kanawha County
West Virginia · Leviathan's Eastern Range
Explicitly within the Leviathan's secondary geological range. The WV Thread is the first corridor thread that the Leviathan can feel being placed.
The Leviathan feels the WV Thread being placed. This is the first evidence in the arc of the geological depth the Expansion Arc is waking. The coal country's specific intersection of industry and geology makes this thread placement the most seismically significant of the five books.
⟡ Warden connection: Morvael's dissolved position · Leviathan secondary range
Book 10
Penn State
Pennsylvania · Atmospheric Layer · Northern Node
The northern node of the eastern Appalachian Web range. D's atmospheric monitoring maps the Ley Line network's surface expression — the first human tool that reads the Warden communications medium.
D's atmospheric work is the most technically significant contribution in the arc. She is building the instrument that will confirm 31 threads = sufficient for the New Compact (WMB6) and will document the Veil's deterioration before the Divine Arc begins. She can hear the Wardens before they fully wake.
⟡ Warden connection: Tharael (Alps) begins to detect the North American signal strengthening
Book 11
Catskill Valley
New York · Written Tradition · Appalachian Northern Terminus
The northern terminus of the Appalachian system before the range loses definition. Secondary Ley Line node connecting to Ilavar's Rocky Mountain position.
Penemue's archive joins the network. The Catskills are the location of Brian Lee's first major geological creature mediation (WMB4) — a rock dragon oriented along the secondary Ley Line connection between the Catskills and Ilavar's Rocky Mountain range.
⟡ Warden connection: Ilavar (Rockies) · secondary Ley Line node · Catskill rock dragon corridor (WMB4)
Thread Count Progress
From 6 Threads to Sufficient
At the start of the Expansion Arc (Year 1), the network holds 6 correctly placed threads from Books 1–6 — the Pike County primary plus five supporting threads from the initial H&H bondings.
The Expansion Arc adds a thread with each new corridor bond. By the arc's end, the count is moving toward the 31 D will confirm as sufficient.
Three of Ravos's seventeen thread locations in WMB1 are at secondary Ley Line nodes between the Expansion Arc's corridors — meaning the Expansion Arc's thread placements are precisely where the Leviathan Arc's geological work needs them.
D doesn't know this yet. She is mapping the atmospheric layer. She will run the models forty times. The answer will be: sufficient. The compact can happen now.
The Warden Communication Medium
Why D Coale Can Hear Them
The Wardens communicate through the Ley Lines' surface expression — the atmospheric weather patterns that run along the routes the Ley Lines follow. D's atmospheric monitoring at Penn State maps these patterns with scientific precision, which means she is, without fully understanding it, mapping Warden communications.
When Tharael of the Alps begins to detect the North American signal, D's instruments register an anomalous high-pressure system over the Atlantic that has no meteorological origin. She flags it in her documentation and keeps running the models.
She will run the models for two years before she understands what she's been hearing.