Leadership: Professor Albin Herzfeld (cult leader)

Territory: Vienna, University of Vienna anatomical theatre

Overview

The Brotherhood of the Open Measure is the Vienna cell of the Aeternum Choir, operating within Austrian academic and official circles. The Brotherhood believes humanity’s error must be eliminated to achieve divine harmony and operates with clinical precision and institutional resources.

Leadership Structure

• Professor Albin Herzfeld (Cult Leader): Engine designer, academic, orchestrator of ritual
• Kapellmeister Friedrich Adler (Second-in-Command): Recruiter, violent, conducts operations
• Baron Otto von Kaunitz (Intelligence Officer): Surveillance, society infiltration, strategic planning
• Count Leopold von Trautmannsdorff (Financial Backer): Funds operations, cowardly, weak link
• Inspektor Ludwig Vogel (Geheimpolizei Mole): Secret police liaison, true believer in Choir

Status

ACTIVE — The Vienna ritual is scheduled for midnight, August 15, 1814 (Feast of the Assumption).

[!warning] Campaign Design Decisions 001 & 002 — RETIRED 2026-04-13 Previous versions of this file required the Vienna ritual to succeed and the University to be unraidable before August 15. Both requirements have been retired. The outcome of the Vienna ritual is now entirely player-determined. See Campaign_Design_Notes.

Operational State — 9 August 1814

[!danger] Session 9 Canon — Brotherhood Decimated Three of four senior conspirators are neutralised. Only Herzfeld and Kaunitz remain operational.

Losses to date:

• Adler — Captured alive at the Palais_Lobkowitz masquerade, 8 August. Both Achilles tendons severed by Georgiana, left hand burned by Varrio. Interrogated in the cellar of Thaliastraße 12. In party custody.
• Trauttmansdorff — Taken into Order custody, 7 August. Cooperating fully. Provided names, locations, financial records, ritual date.
• Dr. Brenner — Killed by Varrio, 4 August. Body discovered by the Brotherhood via Vogel. Staged as accident.

Surviving leadership:

• Herzfeld — Isolated at the University. Informed by Kaunitz of Adler’s capture at dawn on 9 August. Assumes the worst. Fortifying the anatomical theatre: triple guards, Bauer brothers recalled, side entrance sealed or booby-trapped. Accelerating the ritual timetable where possible.
• Kaunitz — Operational lead in the city. Exited the masquerade via the balcony without casualty. Ordered Brotherhood retrievers to recover Adler’s carriage and its dormant Wächter before dawn. Ordered Vogel covered (the Brotherhood cannot afford to lose more people).
• Vogel — Exposed. Attended the masquerade in a domino mask on Kaunitz’s orders as surveillance. Identified by Georgiana beneath the mask. Personally witnessed Adrien’s civilian shooting. Fled the main entrance. Compensating aggressively by pursuing Adrien on the shooting charge. Previously humiliated by Dr. Fischbein’s legal intervention (Session 6).

Wächter status:

• Two destroyed at Palais_Lobkowitz (fire confirmed as hard counter)
• One dormant Wächter retrieved from Adler’s carriage by Brotherhood operatives before dawn, repositioned to University as defensive asset
• Liesel has one dormant Wächter in her care at the University (confirmed in Session_8_Plan)

Assets in enemy hands:

• The party holds Adler alive, the command fork, Anna Lindqvist (the irreplaceable soprano), and a complete interrogation covering: Herzfeld’s office bookcase secret passage, Polizeidirektion strong room location, fork mechanics, Caroline Hartley as a reserve target, and that Wächter are failed integration subjects
• The party’s stolen occult books and Marina’s notebook remain in the Polizeidirektion’s ground-floor strong room under Vogel’s authority

Ritual Segment

Segment V — Harmonic Engine: A clinical, biomechanical interpretation of the Canticle using human bodies as living instruments.

The Harmonic Engine (Core Horror)

The Brotherhood’s signature contribution to the Grand Canticle is the Harmonic Engine — a 30-foot biomechanical instrument constructed from human body parts:

• Pipes: Bronzed esophageal tubes serve as wind pipes
• Bellows: Human lungs as pneumatic chambers
• Keys: Arms and hands wired to mechanical levers
• Heart: A living human brain at the Engine’s center, interpreting the Canticle score
• Victims: Fully conscious but paralyzed via Austrian alchemical neurotoxins

The Engine is an instrument designed to sacrifice multiple humans simultaneously while keeping them aware of their fate — a deliberate amplification of suffering.

Ritual Site

A sealed anatomical theatre beneath the University of Vienna. The location provides:

• Acoustic properties amplifying harmonic frequencies
• Anatomical resources (cadavers, specimens, surgical equipment)
• Institutional cover and respectability
• Underground access preventing discovery

Ritual Date

Midnight, August 15, 1814 (Feast of the Assumption)

Alert Level

3 — Direct Action Authorized (escalating to 4 by mid-morning 9 August)

Response Protocols by Level

Level 0 — Unaware: Normal operations, standard security.

Level 1 — Curious: Kaunitz assigned to learn more. Vogel pulls registration papers and notes lodging. Increased attention, no direct action. Triggers: asking about Herzfeld, visiting Falkner, attending events where Kaunitz is present.

Level 2 — Concerned: Active surveillance (Kaunitz + hired watchers). Vogel monitors movements through police network. Investigators’ lodging searched when away. Mail intercepted. Servants bribed. Triggers: visiting the University anatomical wing, asking about missing musicians, contact with Brenner.

Level 3 — Threatened (CURRENT): Direct action authorised. Adler tasked with “handling” the problem. Vogel prepares false charges. Trauttmansdorff uses political connections to discredit. Methods include assassination attempts, false arrest, social destruction, kidnapping, and intimidation of contacts. Triggers: finding Brenner, breaking into the University, interfering with victim acquisition, obtaining cult documents, approaching Metternich.

Level 4 — Desperate (IMMINENT): All resources committed. Herzfeld may personally intervene. Ritual accelerated if possible. Mass assault, hostage-taking, framing for murder, burning evidence. Herzfeld’s last resorts: activate Engine early (dangerous), use Voice of the Spheres to incapacitate attackers, threaten to destroy victim evidence, attempt to flee Vienna, or activate Engine as weapon (localised reality distortion). Triggers: Engine sabotaged, key members captured, Metternich convinced, authorities raiding University.

Level 5 — Endgame: Final confrontation. Full cult defence at the theatre. Engine may be partially activated as weapon. Survivors scatter. Trauttmansdorff surrenders and talks. Kaunitz attempts to blend into chaos and escape. Adler fights to death (now moot — captured). Herzfeld may commit suicide rather than be captured.

Outer Circle (Useful Believers)

These individuals serve the cult but believe they are part of an exclusive musical society or experimental medical programme.

• Dr. Gottfried Reiner (Chemist, age 44, INT 80, Chemistry 85%) — University chemist producing neurotoxins and preservation fluids. Believes he is developing revolutionary anaesthetics for terminal patients. Has never visited the theatre. His conscience is exploitable if shown evidence.
• Herr Gustav Metzger (Craftsman, age 52, STR 65, DEX 70, Mechanical Repair 80%) — Master instrument maker building what he believes is an experimental pipe organ. Works only during the day; Adler’s people install the organic parts at night. Professional pride is the lever.
• Liesel_Hartmann (Nurse, age 28, APP 55, First Aid 65%, Medicine 40%) — Administers sedatives and monitors “volunteers” she is told are terminally ill. Genuinely compassionate. Has never seen the Engine itself. Session 9 status: Adler’s capture and whatever Varrio told her at the masquerade about Brenner have lowered her conversion threshold. She will return to the University and may ambush or sabotage Varrio if the party reaches the anatomical theatre, unless turned first.

Servants (Unwitting Tools)

• Klaus and Werner Bauer (twin brothers, former soldiers, hired muscle) — Procure bodies from morgues and elsewhere. 50 gulden per delivery. Recalled to the University as guards as of 9 August. The Freddy-held intelligence from Fischbein places them at the Black Bear tavern.
• Frau Ingrid Sperl (Housekeeper) — Maintains the sealed theatre, brings food and supplies. Terrified of Adler; will talk if protected from him.
• Three University porters — Bribed to look the other way during night deliveries. Know something illegal is happening.

Geheimpolizei Infiltration

• Captain Ludwig_Vogel — Senior officer, true believer. See Operational State above for current status (exposed, compensating).
• Sergeant Franz Huber — Street-level agent, bribed by Kaunitz. Pure mercenary, not a true believer. Reports on “persons of interest.” Will switch sides for more money or under threat of exposure.

Key Members & Contacts

Ally/Contact NPCs:

• Graf Johann von Reichenbach (court official, composer “Heinrich Schiller”): Terrified witness, knows too much
• Major William Thurner (Austrian Order operative): Masquerade contact
• Dorothea de Courlande (Talleyrand’s niece): French intelligence conduit
• Countess Maria Wilhelmine von Thun (society patron): Social access provider
• Count de la Tour-du-Pin (French delegation): Intelligence source

Complications:

• Graf Maximilian von Sternberg (Austrian officer, Fourth Hussars): Romantic complication with Emma
• Thomas Wyndham (British officer): Protective of Emma, increasingly volatile

Campaign Goals

The Brotherhood’s operational objectives:

1. Complete the Harmonic Engine: Assemble and consecrate the biomechanical instrument
2. Secure Sacrificial Victims: Identify and capture suitable candidates for transformation
3. Prepare the Canticle Score: Copy and arrange Herzfeld’s harmonic notation
4. Prevent Disruption: Eliminate or neutralize Order opposition
5. Execute the Ritual: Perform Segment V at midnight, August 15

Intelligence Available to Order

Through infiltration, interrogation, and captured documents, the Order can obtain:

1. The “5 of 8” requirement (minimum threshold)
2. The summer solstice 1815 deadline
3. The list of remaining active cells
4. The Harmonic Engine score
5. Der Kantor contact information (Munich coordinator)

These handouts are critical for the campaign’s transition to endgame structure.

The Harmonic Engine — Current Status (9 August 1814)

The Engine was approximately 85% complete as of August 3. Main frame, lower register pipes, bellows, keys, preservation fluid circulation, and acoustic chamber modifications are all functional.

Outstanding requirements:

1. Soprano voice (CRITICAL — DISRUPTED): Anna was the confirmed and irreplaceable target. She is now in party custody at Thaliastraße 12. Caroline_Hartley was named by Adler as a reserve target, but the Brotherhood has not yet moved on her. Without a soprano, the ritual cannot succeed.
2. Conductor brain (CRITICAL): The current brain (a philosopher captured six months ago) is deteriorating. It can manage simple harmonics but lacks the mathematical sophistication for Segment V. Herzfeld has considered using himself but fears the loss of agency.
3. Final calibration (3 nights, Aug 12-14): Requires the Engine partially active with all components. Cannot begin until the soprano is installed.
4. Ritual score (COMPLETE): Herzfeld has the full notation for Segment V encoded in a harmonic-interval cipher, stored in his University office and private apartments (two copies).

Access: A secret passage behind a bookcase in Herzfeld’s University office leads directly to the anatomical theatre, bypassing the main guard station. The party learned this from Adler’s interrogation.

Metternich’s Awareness

Current status (9 August): Metternich’s official line on the Palais_Lobkowitz incident is “anarchist attack by radical agitators of Jacobin sympathy.” He intends to make the party the scapegoats unless they can bring him evidence (Adler alive) or otherwise convince him to look elsewhere. He has summoned the party to the Ballhausplatz through Gentz.

What he knows: Disappearances have increased over two years, reports keep getting lost or resolved, someone is manipulating his police apparatus, Herzfeld has powerful friends who deflect inquiry.

What he does NOT know: The cult exists, the Engine’s nature, that Vogel is compromised, the August 15 deadline.

How to turn him: Present irrefutable evidence, frame it as a threat to the Congress, approach through a trusted intermediary (NOT through normal police channels), accept he will want to handle it quietly. If the party brings Adler alive to the Ballhausplatz, Metternich becomes a potential ally for a University assault.

The Aeternum Choir’s Network

Herzfeld has a single point of contact with the broader Choir: “Der Kantor” (The Cantor), a codename for someone in Munich who coordinates Central European operations. Communication by coded letter, 5-7 days each way. Der Kantor sent the August 9 warning about “English hunters.”

Cell status known to Herzfeld:

• London (Orphean Society): DISRUPTED — late June
• Lyon (Confrérie du Saint-Silence): DISRUPTED — late July
• Venice (Confraternita del Bel Canto): DISRUPTED from within — August 1

If investigators capture Herzfeld’s correspondence, they can learn:

• Other cells exist (Warsaw, Luxor, Varanasi, Chengdu, Ouro Preto still active)
• The summer solstice 1815 deadline for the Grand Canticle
• The “5 of 8” requirement for the Final Chorus
• Munich contact address (useful for future chapters)

Keeper Strategy Notes

Brotherhood Paranoia: By August, the Brotherhood knows:

• London cell: disrupted
• Lyon cell: disrupted
• Venice cell: disrupted from within by unknown traitor
• Order operatives: actively hunting

Response: Alert Level 3, assassination authorized, constant surveillance, recruitment acceleration, security tightened.

Weak Link: Trauttmansdorff was the weak link and broke exactly as predicted (Session 7). Liesel Hartmann is the remaining conversion target — compassionate, lied to by the Brotherhood, and shaken by Adler’s capture.

University Assault (Session 10+): The anatomical theatre is now fortified. Herzfeld has recalled the Bauer brothers, sealed or booby-trapped the side entrance, and positioned at least one Wächter as a defensive asset. The secret passage through Herzfeld’s office bookcase is an alternative entry the Brotherhood does not know the party has learned. If the party brings Adler to Metternich and turns him, the Geheimpolizei and Austrian military become available for an assault.

[!info] Vienna Ritual Outcome — Player-Determined The August 15 ritual is a real fight with a real outcome. As of 2026-04-13, the previous requirement that the ritual must succeed has been retired. The Brotherhood will fight to complete Segment V; the party may stop them, fail to stop them, or land somewhere in between. Run it honestly.

[!danger] Alert Level 3 — Direct Action Authorized, escalating to 4 (Desperate) by mid-morning 9 August as the political apparatus activates. Three of four senior conspirators neutralised. Herzfeld is fortifying the University. The Brotherhood’s operation is in immediate jeopardy — the ritual is at risk without a soprano and without Adler to conduct.

Relationships

• Member of Aeternum Choir — Vienna cell of the global Aeternum Choir
• Enemy of Order of St Aelfric — Order opposition in Vienna chapter
• Allied with Geheimpolizei — Austrian secret police cooperation under Metternich
• Leads Professor Albin Herzfeld — Cult leader and Harmonic Engine designer
• Member of Anton Adler — Second-in-command, recruiter, violent
• Member of Baron Otto von Kaunitz — Intelligence, surveillance, society infiltration
• Member of Count Leopold von Trautmannsdorff — Financial backer, coward, weak link
• Allied with Inspektor Ludwig Vogel — Geheimpolizei mole and true believer
• Headquartered at University of Vienna — Sealed anatomical theatre beneath the University serves as ritual site and operational base