Source proposal: [Brief 342043](/Hold%20The%20Flood/Brief?revision=342043#earned-spectacular-build-the-choir-cascade), checked against [Inventory and Charge 810057](/Hold%20The%20Flood/Mechanics/Inventory%20And%20Charge?revision=810057), [Coil 80da75](/Hold%20The%20Flood/Equipment/Coil?revision=80da75), [Arc fc64bb](/Hold%20The%20Flood/Equipment/Arc?revision=fc64bb), [Combat 600893 §12](/Hold%20The%20Flood/Mechanics/Combat?revision=600893#12-the-choir-cascade--combats-ruling-on-damage-eligibility-hop-ordering-and-caps) and [Colony cf90ad](/Hold%20The%20Flood/Colony?revision=cf90ad#hearth-growth-proposal--authored-projects-not-population-bars). [Design Index](/Hold%20The%20Flood/Design%20Index) · [Expansion Brief](/Hold%20The%20Flood/Expansion%20Brief) · [Glossary](/Hold%20The%20Flood/Glossary).
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Source proposal: [Brief 342043](/Hold%20The%20Flood/Brief?revision=342043#earned-spectacular-build-the-choir-cascade), checked against [PMR011 726f09](/Hold%20The%20Flood/PM%20Reviews?revision=726f09#pmr011-current-review-checkpoint), [Inventory and Charge 810057](/Hold%20The%20Flood/Mechanics/Inventory%20And%20Charge?revision=810057), [Coil 80da75](/Hold%20The%20Flood/Equipment/Coil?revision=80da75), [Arc fc64bb](/Hold%20The%20Flood/Equipment/Arc?revision=fc64bb), [Combat 600893 §12](/Hold%20The%20Flood/Mechanics/Combat?revision=600893#12-the-choir-cascade--combats-ruling-on-damage-eligibility-hop-ordering-and-caps) and [Colony cf90ad](/Hold%20The%20Flood/Colony?revision=cf90ad#hearth-growth-proposal--authored-projects-not-population-bars). [Design Index](/Hold%20The%20Flood/Design%20Index) · [Expansion Brief](/Hold%20The%20Flood/Expansion%20Brief) · [Glossary](/Hold%20The%20Flood/Glossary).
The **Echo Relay** is a proposed earned, one-cell electrical module found in the upper sanctuary before the first credits. It turns previously tuned wet landmarks into repeated origins for one coordinated Coil-and-Arc discharge and is the new component in the proposed **Choir Cascade**. It does not strengthen every attack, power arbitrary scenery or replace the early Cutter, Coil or Arc; it rewards remembering where conductive landmarks are, bringing the old parts together and surrendering most carrying capacity for a prepared crowd-clearing event.
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All counts and timings are provisional written rules, not tested balance, performance or feasibility. Brief 342043 carries the legal chassis and landmark-origin grammar for the working vision. Combat 600893 supplies the current damage, eligibility, ordering and four-origin cap; Equipment recommends a bounded seven-origin revision below because the present result does not meet the Brief's stated wipe.
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All counts and timings are provisional written rules, not tested balance, performance or feasibility. Brief 342043 carries the legal chassis and landmark-origin grammar. Combat 600893 supplies the damage and eligibility proposal; PMR011 selects seven tuned origins provisionally and requests an explicit Relay-only execution rule, deterministic ties and a same-scene comparison.
## E9 — Equipment specification
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**Player action and trigger.** At a shelter the player fits the six-cell chassis and chooses the two links. In the field, after tuning the authored bells or another explicitly Relay-compatible wet landmark network, the player selects Echo Relay. The preview requires both linked batteries full, a valid connected wet footprint, and at least one tuned landmark currently visible. Confirming spends both ten-charge banks at once. A dry or incomplete network, a partial bank or an incompatible landmark refuses without cost. The Relay then becomes **spent** until the next shelter, even if the batteries are refilled; this prevents immediate loops from the cleared crowd's normal motes without inventing a no-yield enemy exception.
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**Effect and target — current Combat ruling.** Coil injects its ordinary two-second pulse into the connected wet footprint, stunning conducting bodies for eight seconds. At most **four** visible tuned landmarks become Arc origins during that pulse. Resolve the landmark nearest the player first, then outward; within each origin use Arc's nearest-first, then nearest-the-player tie rule. Each origin seeds one standard chain: its first body plus at most three additional bodies using the existing three-metre, line-of-sight hops. A body claimed by an earlier origin is ineligible for a later one. A chained hit kills a stunned ordinary body outright; against an unstunned body it remains one Cutter-hit contribution. Crust is neither target nor hop. A Heavy conducts and can be claimed, but one chained hit does not satisfy its ten-hit requirement. Current maximum: sixteen ordinary kills.
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**Effect and target — PMR011 provisional synthesis.** Coil injects its ordinary two-second pulse into the connected wet footprint, stunning conducting bodies for eight seconds. Up to **seven** visible tuned landmarks become Arc origins during that pulse. Resolve the landmark nearest the player first, then outward; exact landmark-distance ties use the recorded seven-part tuning order. Within each origin, choose the nearest eligible body, then use Arc's nearest-first / nearest-the-player tie rule for up to three additional three-metre, line-of-sight hops. A body claimed by an earlier origin is ineligible for a later one.
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**Visible information.** Before confirmation, draw the conductive footprint, number eligible landmarks by their distance order, highlight the first four as active origins and mark any later tuned landmarks `beyond current Relay cap`. Show the bodies each active origin currently claims, mark duplicates as claimed by the earlier origin, and state `20 charge / up to 16 ordinary clears / Relay spent until shelter`. Cross out Crust; mark a Heavy `one of ten hits`. Use lines, symbols and counts in addition to colour. When the network is broken, show the first dry gap or untuned landmark. During the effect, resolve origins sequentially so the source of each chain remains visible; this page claims no art asset or verified readability.
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Only a **Relay-origin chain during this same activation** executes a Coil-stunned ordinary body. Cutter-origin chains from an ordinary Arc burst remain one Cutter-hit contribution even if the target was stunned earlier; Coil + Arc without Relay therefore keeps its existing rules. Crust is neither target nor hop. A Heavy conducts and can be claimed, but is not an ordinary body for this interaction: one Relay-origin hit does not satisfy its ten-hit requirement. Current maximum: twenty-eight ordinary kills. This is a narrow combination rule, not a global change to Stunned or Arc.
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**Visible information.** Before confirmation, draw the conductive footprint, number the seven eligible landmarks by their resolution order and show the four-body claim path from each. Mark duplicate bodies as owned by the earlier origin and state `20 charge / 7 origins / up to 28 ordinary clears / Relay spent until shelter`. Cross out Crust; mark a Heavy `one of ten hits`. Use lines, symbols and counts in addition to colour. When the network is broken, show the first dry gap or untuned landmark. During the effect, resolve origins sequentially in the previewed order so the source of each chain remains visible; this page claims no art asset or verified readability.
**Resource and opportunity cost.** The base build spends twenty charge, consumes six cells and leaves only two for cargo or safety. It has no Insulation, Kit, Beacon or alternative primary unless the player gives up part of the cascade. Carrying two ordinary bundles retains a hauling payoff but risks leakage if packed against a charged bank. Firing early may clear only a few bodies and still spends both banks plus the Relay's one activation.
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### Cargo branch — six cells of equipment, two cells of return value
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Bring the legal base rack and reserve the last two cells for finds. Tune the wet landmarks, let the crowd fill their footprint, preview the distinct Arc claims and fire. The player learns that the old Coil does more than hold bodies: in the Relay network its stun makes chained hits lethal and its short world-power pulse decides where Arc begins. The current payoff is a broad but capped clear of at most sixteen ordinary bodies. A Crust, Heavy, dry flank or fifth cluster can leave a dangerous survivor between the player and the dropped motes. The reason to keep the early parts is structural: removing Coil removes the stun and wet pulse, removing Arc removes damage, and removing either battery makes the trigger illegal.
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Bring the legal base rack and reserve the last two cells for finds. Tune the wet landmarks, let the crowd fill their footprint, preview the distinct Arc claims and fire. The player learns that the old Coil does more than hold bodies: in the Relay network its stun makes Relay-origin chains lethal and its short world-power pulse decides where Arc begins. The current payoff is a bounded clear of at most twenty-eight ordinary bodies. A Crust, Heavy, dry flank, eighth cluster or poor spacing can leave a dangerous survivor between the player and the dropped motes. The reason to keep the early parts is structural: removing Coil removes the stun and wet pulse, removing Arc removes damage, and removing either battery makes the trigger illegal.
### Siphon-readiness branch — all eight cells committed before conversion
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**Rejected alternative — a Relay-only Siphon overdrive.** An earlier Equipment proposal let the sacrifice widen the effect to every ordinary body in the wet footprint. Brief 342043 rejects it because Relay already supplies the new multiplication rule and a second exception is unrelated to the first Bell House lesson. Keep Siphon as readiness help, not overcharge. The rejected wording remains in [Echo Relay b96175](/Hold%20The%20Flood/Equipment/Echo%20Relay?revision=b96175).
**Proposed authored setup.** The central furnace floor is one visibly connected wet footprint divided by dry grates into seven bell-marked burner bays. Each tuned bell has a cluster of four ordinary bodies within a readable three-metre/line-of-sight chain; the dry gaps keep clusters from silently merging. One Crust stands on a marked dry grate, one Heavy guards the exit and a later wave remains beyond the closed intake. The preview therefore shows seven complete four-body claims, with the Crust and Heavy excluded from execution. Twenty-eight is encounter composition for this written illustration, not a roster-wide surge size or tested performance target.
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At the seven wet bells, ordinary Flood fills the connected water while a Crust stands on a dry plinth, a Heavy blocks the fifth bell and another group approaches through a dry gallery. The Coil bank is full but an earlier Arc burst left its bank at seven. With Siphon and a wet bundle fitted, the player previews `Arc bank 7 → 10`, consumes both, then sees the seven bells numbered nearest-outward. The first four show their claims; bells five through seven show `beyond current Relay cap`; the Crust is crossed out and the Heavy shows one of ten hits. Firing spends both banks, stuns the connected conducting crowd and kills at most sixteen claimed ordinary bodies. The Crust, Heavy, fifth cluster and gallery group survive and close on a player with empty banks, a spent Relay and no Kit or Insulation. The alternative was to arrive with both banks full and use those cells for extracted value or safety.
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**Paying for the moment.** Both banks begin empty. The furnace approach offers at least twenty fresh ordinary bodies across two optional side galleries; fighting within pickup range can fill the two banks under the existing once-per-body rule, but costs time/exposure and yields no persistent salvage. A player who reaches one bank at seven may instead consume fitted Siphon + one wet bundle for the last three charge, sacrificing both final cells and the bundle's return value. No free Hearth charge is invented. At the furnace, confirming Relay spends all twenty charge and its one activation. Seven chains resolve in previewed order and clear the twenty-eight ordinary bodies; the Crust, Heavy and forecast later wave remain.
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## Open cap recommendation — seven origins, not four
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**Consequence beyond killing.** The clear exposes three manual furnace dampers around the ring. Each takes a short hold and the route between all three exceeds Coil's eight-second stun window; a visible later-wave forecast is long enough for the proposed Relay clear to buy the circuit, not guaranteed safety afterward. Turning all three restarts the furnace and earns the apparent-ending consequence in Brief 342043. Exact holds, path time and arrival interval belong to Campaign/Combat and remain provisional; the required relationship is `more than 8 seconds to complete the circuit, less than the visible post-clear interval`, not a hidden timer.
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Combat's four-origin cap is the current working rule and is mirrored above. Equipment recommends revising this Relay-specific cap to **seven visible tuned origins**, still four bodies per standard chain and therefore at most twenty-eight ordinary bodies. Seven is better here because the earned environmental pattern has seven bells: making the last three visibly inert after the player learned and tuned them weakens the clue-to-build payoff. Sequential nearest-outward resolution plus the pre-fire ownership preview keeps all seven inspectable without reopening unbounded water propagation.
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**Same scene without Relay.** Coil alone stuns all conducting bodies for eight seconds but kills none; the three-damper circuit cannot be assumed complete before recovery. Coil + ordinary Arc can then spend its separate bank, but only Cutter-origin chains occur: each hop remains one Cutter-hit contribution and the player must stay near the crowd long enough for automatic Cutter attacks rather than simply run the dampers. It may thin the room, but it receives neither seven remote origins nor Relay-only execution and cannot claim the written twenty-eight-body clear. The Relay therefore changes the action and outcome rather than serving as a ticket for an interaction Coil + Arc already had.
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The credible four-origin alternative is easier to read and leaves more of a small surge alive. Keep it if readability outranks the stated spectacle, but then revise the Brief's `wipes ordinary Flood across the screen` promise to `clears a broad opening`. Twenty-eight is still not a guaranteed full-surge wipe, so neither number should be described as empirically spectacular. Combat owns the cap; Lead and PM own the cross-document choice.
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**Credible alternative.** Combat's earlier four-origin/sixteen-body version is easier to read and leaves more of the first wave active. PMR011 declines it provisionally because it leaves three learned bells inert and does not earn the written payoff. Keep the seven-origin cap for this pass, with sequential cues and pre-fire claims; if the result later proves unreadable in an authorized play phase, cap reduction is the first tuning candidate. No tested readability or spectacle is claimed now.
## Interfaces still requiring owning-role decisions
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- **Combat:** 600893 closes damage, eligibility and deterministic ordering. Equipment mirrors four origins/sixteen bodies as current but recommends seven/twenty-eight above; Combat should countersign or rebut that specific cap revision.
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- **Lead/PM:** choose whether the written promise is a four-origin broad clear or a seven-origin, more clue-complete payoff; neither page may claim tested spectacle.
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- **Combat:** countersign or revise the Relay-only execution boundary, exact landmark-distance tie and seven-origin furnace composition. Ordinary Coil + Arc remains unchanged.
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- **Lead/Campaign:** place the seven-bay furnace footprint, two optional charge galleries, three-damper circuit and visible later wave, or replace them with geometry that preserves the same paid comparison.
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- **PM:** PMR011 provisionally selects seven origins/twenty-eight maximum and accepts neither tested spectacle nor blanket catalogue balance.
- **Lead/shared resource:** mirror the corrected two-bank chassis when the working vision is integrated; no Siphon exception is requested.
- **Campaign/World:** define which authored wet landmarks are tunable and make their connection observable; Relay compatibility must not turn every puddle or clue prop into an origin.
- **Colony:** the automatic first-return resonance display may explain an already-known legal rack; it never gates issue, unlocks Relay or supplies charge.
