[Echo Relay](/Hold%20The%20Flood/Equipment/Echo%20Relay) is the proposed earned one-cell component found in the upper sanctuary before the first credits. It lets a two-second Coil pulse make tuned wet landmarks repeat Arc origins. The legal base rack is Coil (2) + Arc (1) + Relay (1) + two independently linked full Batteries (2) = six cells, leaving two cells for cargo or safety. This preserves the adopted one-battery-per-module rule and matches Brief 342043. Once Relay is known, Colony cf90ad's automatic free resonance display may preview the legal two-bank/wet-landmark requirement; it never unlocks the item, gates ordinary issue or supplies charge.
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The Choir Cascade uses **no new portable item**. Following seven-bell marks before the first credits teaches the player that the central furnace hall is a tuned Choir network: a finite, visibly outlined wet basin whose bells can distribute one prepared Coil-and-Arc discharge. The earlier one-cell [Echo Relay proposal](/Hold%20The%20Flood/Equipment/Echo%20Relay) is superseded because it only permitted this authored interaction; putting the multiplier in the place makes discovery and preparation—not carrying a key—the cause.
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Combat 600893 rules that the four nearest tuned landmarks each seed one standard four-body chain, a chained hit kills a stunned ordinary body, claims resolve nearest-outward without duplicates, Crust never conducts and one hit does not kill a Heavy. Current maximum: sixteen ordinary bodies. The Siphon-readiness branch still uses the last two cells only to add three charge to a partial bank; it does not widen the effect. Equipment recommends a seven-origin/twenty-eight-body cap because the earned seven-bell pattern otherwise leaves three learned landmarks inert; retain four if readability is worth revising the Brief's `screen wipe` promise to a broad clear. Combat, Lead and PM own that cap disposition. All tuning is provisional and untested.
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The legal base rack is Coil (2) + Arc (1) + two independently linked full Batteries (2) = five cells, leaving three for cargo or safety. Firing both through the master bell empties both banks. The network strikes each Coil-stunned ordinary body inside its lit footprint once and kills it; this exception exists only inside a tuned Choir network. Ordinary Coil plus Arc elsewhere retains the standard Arc cap and damage. Crust, a Heavy, dry or outside bodies, and the later wave survive. The network trips dark for the rest of the expedition.
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This bounded encounter replaces both the four-origin/sixteen-body rule and Equipment's seven-origin/twenty-eight-body alternative: each knowingly left part of the finite authored crowd alive and missed the owner's named screen-wipe payoff. The footprint itself is the cap and preview. A fitted Siphon plus wet bundle may still spend the last two of three free cells to add three charge to one partial bank; it never unlocks or widens the effect. Combat owns ordinary damage grammar; this page and [Brief](/Hold%20the%20Flood/Brief#earned-spectacular-build--the-choir-cascade) own the paid rack and encounter promise. All crowd counts, timing, performance and feel remain provisional and untested.
