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Technology — The Maintenance Civilisation Arbour operates on what could be called ritual engineering — procedures followed precisely because deviation causes death, but without understanding the underlying principles. The Azure Branch are essentially a technol...

Arbour — Power Grid Lives in: World & Lore → Core Systems. Status: revised — R4/R5 status corrected to remove "the Heart" reference, consistent with the scattered debris field framing locked in Kugelblitz Jettison Mathematics (revised). No other changes from t...

Political Systems Arbour's political structure is designed to look like governance while functioning like control. Understanding the difference between what is visible and what is real is the first step toward understanding everything Wren uncovers. Overview —...

In a closed system, nothing is wasted. The Verdant Branch's official documentation calls this principle "sustainable cycle integration." The Sprawl calls it something less elegant and more accurate. Both are describing the same water. Overview Arbour is a clos...

Arbour - Transport How people move through Arbour tells you everything about who they are and what they're permitted to be. The transit system was not designed to reinforce the hierarchy. It simply does, because everything in Arbour does, because the hierarchy...

Three Act Structure Overview Overview Sempiterni follows a specialised version of the three-act structure used in psychological horror. Rather than mapping purely external threats, the structure tracks the protagonists' internal mental decay and unravelling gr...

Build these documents before drafting begins. Each one should be Weir-level detail — specific enough that every scene writes itself. Physical Systems [x] Arbour's power grid — how it works, what fails, what each tier receives, failure cascade behaviour [x] Wat...

The complete mathematical record of ARBOUR|05's final approach, drive jettison, and impact event. These numbers are the foundation of the crash history, the power grid document, and the formation of the debris field beneath and around Arbour. When in doubt, re...

1. Penumbran Language — Three-Layer Architecture Penumbran language is a hybrid: it has both a spoken/vocal dimension and a resonant/acoustic dimension, and these do different communicative work.  Layer Register Survival Notes Spoken Intimate, immediate, situa...

New deep-dive document. Characters → Antagonists. Supersedes nothing — the existing "Cassan Vale — Origin and Psychology" document (in Characters.md and embedded in World & Lore → Political Systems) remains accurate and complete for everything from the adoptio...

Lives in: Prose & Voice → Glossary. Comprehensive, pure alphabetical, pulled from: World Systems/Core Systems, Power Grid, Political Systems, Water & Food, Transport, Penumbran Language & Naming, Cassan Vale (Antagonists), Kugelblitz Jettison Mathematics, and ...

1. Propulsion Systems Architecture ARBOUR|05 relied on a tiered propulsion system to handle the distinct phases of interstellar colonisation. Launch Phase: Metastable Metallic Hydrogen Function: Escaping Earth's gravity well. Mechanics: Utilized disposable, ho...

Species & Physiology — Foundational Premise Lives in: World & Lore → Core Systems, alongside World Systems. This document states an in-universe foundational premise that was previously implicit (visible in details like Aran's "bleached fur tips," dialect-not-s...

Purpose of This Document Book One needs to feel like the opening of a series, not just a complete, self-contained story with a sequel hook bolted on. The chosen solution is not to make the five-arks mystery Book One's main plot — that would require restructuri...

Who Wren Is, At Surface Level Wren Emberlain is a sand cat, non-binary, 33 years old, archivist in Arbour's Tabularium. Precise, analytical, introverted. Mid-tier dialect — analytical precision with occasional rougher cadences that betray a Sprawl-adjacent upb...

Who Aran Is, At Surface Level Aran Sunderwood is a coyote, Wayfarer, 29 years old, scout and tracker. Physical, instinctive, terse. Bleached fur tips and a weathered build — visible, unmistakable evidence of sustained Badlands exposure, which carries real and ...

The Convergence (The Source) The Convergence is the entity itself—an unknowable, eldritch reality existing outside of human dimension. It does not act with human malice; it simply is. It operates under the cosmic assumption that it is "completing" the matter i...

1. Identity & Origin The Penumbrans (formal/scholarly) or "The First-Walked" (vernacular Wayfarer term) were the native civilisation of the Penumbran Reach (KOI-8565). Biology: They were anthropomorphic, similar to the species that populate Arbour, but evolved...