Descent Protocols — The Tower

Descent Protocols constitute the legally-binding framework governing all authorized vertical exploration within The Tower. Established by The Directorate of Descent and maintained by the Office of Catalogic Logistics, these protocols provide a standardized system for the classification, approval, documentation, and execution of journeys between floors, superseding all earlier, ad hoc systems of traversal such as those referenced in the pre-Directorate General Administrative Protocols. The phrase "Descent Protocols" refers simultaneously to the overarching regulatory corpus, the individual, codified route documents (e.g., Descent Protocol Delta-7-22), and the administrative practices enacted by authorized personnel.

Constitutional Basis

The authority of the Descent Protocols is derived from a composite of foundational documents, a situation that frequently results in jurisdictional ambiguities. The most cited source is Clause 33, Annex Delta, which explicitly mandates the creation of a "system of approved routes." However, Clause 12, Annex Gamma grants the Librarian-in-Charge of any floor the prerogative to "determine conditions of egress," a clause often invoked to contest the applicability of centrally-issued protocols. This tension is nominally resolved by the Chen Protocol, which stipulates that a Descent Protocol, once registered, takes precedence over local edicts unless a formal Cessation is filed. In practice, most exploration relies on a fragile concord between the Directorate and floor-level authorities.

Structure and Classification

Each approved protocol is assigned a unique alphanumeric identifier according to a system detailed in the Registry of Protocols. The identifier comprises a Greek letter prefix (denoting the protocol class), a sequential number, and a two-digit year of ratification (e.g., Sigma-1-23). The primary classes are:

Delta (Δ): General-Purpose Descent. The most common class, covering routes for routine archival research, supply conveyance, and personnel transfer. Descent Protocol Delta-7-22 is a canonical example.
Sigma (Σ): Security & Preservation Descent. Authorized for handling sensitive or fragile holdings, such as the Nictitating Vellum. Descent Protocols Sigma-1 through Sigma-9 govern all Vellum Descent operations.
Omega (Ω): Provisional & Experimental Descent. Granted for exploration into poorly catalogued or theoretically unstable regions. Their issuance requires unanimous consent from the Directorate and is subject to stringent review under Security Protocol Sigma.
Alpha (): Ascendant Protocols. Technically falling under the purview of the Keepers of the Ascent, these govern movement upward along the Gradient of Ascent/Descent and share many procedural elements with Descent Protocols, though their philosophical underpinnings are distinct.

Application and Execution

The execution of a Descent Protocol is a multi-stage process. Initiation requires the submission of Form M-7b (Rev.) to the local Lower Scriptorium, which verifies the requester's authority against the Registry. Following approval, the descent is conducted as a Guided Descent, wherein the route must be followed precisely as documented, including prescribed pauses, ritual observations at specific landings, and the completion of interim log entries. Deviation from the documented protocol renders the descent "Unguided" and voids all insurance and indemnity clauses. A notable exception is triggered by the condition of Recursive Descent, which suspends standard guidance when the subject of the descent is itself a documented descent process.

Historical Development and Controversies

The modern system of Descent Protocols was largely formalized during The Great Re Cataloguing of the Spiral 77, which sought to bring order to the chaotic and often contradictory travelogues of the early Tower era. A significant schism in protocol philosophy is recorded in the debates surrounding the First Spire Delineation Protocols. The "Absolutist" school, led by the early Directorate, argued that protocols should describe only physically verifiable stairwells and apertures. The "Conceptualist" school, drawing from the Vellum Descent tradition, maintained that a properly constructed protocol could describe a descent through purely notional or thematic spaces—a viewpoint that eventually gained limited acceptance with the creation of the Omega class.

The most persistent controversy concerns the alleged existence of a primordial set of protocols, referred to in fragmentary glosses simply as "the Descent Protocols," believed to predate the Directorate and to have been lost. These are theorized to be held on the mythical Floor 404. Scholarly opinion is divided between those who believe they were lost to catastrophic systemic failure and those, citing the Chen Protocol's emphasis on logical security, who believe they were intentionally sequestered due to containing route information deemed too perilous for general circulation.

Administration and Archival

The Registry of Protocols, a subsidiary of the Office of Catalogic Logistics, serves as the definitive repository for all ratified Descent Protocols. The Registry is responsible for their physical preservation, distribution to relevant Scriptoria, and periodic amendment. Amendments are not undertaken lightly; each requires a full review under the guidelines of the Chen Protocol to assess downstream logical vulnerabilities. The Registry also maintains the Index of Revocations, which lists all protocols rendered obsolete by Cessation, architectural rearrangement, or ontological shift within the destination floors. A protocol's presence in the Index does not, however, guarantee the cessation of its effects, a fact documented in several tragic cases of "Echo Descents."