The corridor ends at a tall black-stone door set into a ring of greened bronze. Eight palm-sized discs circle a central keyhole, each carved with a different sign: sun, crown, key, wave, eye, moon, flame, and star. Dust trembles whenever the discs turn. A cold blue line traces the door's frame, while the plinth beside it bears a neat inscription; faint tones rise from the lock as if the stone itself is listening.
You enter a narrow chamber where a black-stone door fills the far wall. Eight bronze symbols circle its keyhole, and a blue line of light traces the frame. Beside it, an inscription waits on a waist-high plinth. The air smells of wet stone and old metal; when dust drifts across the discs, a low note hums through the floor.
The discs turn individually with a firm click and can be rearranged without tools. The inscription is readable, and the symbols match its names. Correct neighboring relationships produce a steady tone; a violation makes the blue line flicker. Let players test ideas freely before calling for checks.
Give the group a few minutes to translate the clues into an order. If they debate what 'leads' means, clarify it means earlier in the sequence. Offer the tier 1 hint after a lull, tier 2 when they have identified some relationships, and tier 3 if they remain stuck. Escalate pressure only if the scene needs it.
The corridor ends at a tall black-stone door set into a ring of greened bronze. Eight palm-sized discs circle a central keyhole, each carved with a different sign: sun, crown, key, wave, eye, moon, flame, and star. Dust trembles whenever the discs turn. A cold blue line traces the door's frame, while the plinth beside it bears a neat inscription; faint tones rise from the lock as if the stone itself is listening.
The eight signs and the ordering inscription are visible from the entrance. The symbols are distinct enough to identify without a check; characters who inspect the frame can also see that the door responds to the relationship between neighboring discs.
Set every sign once, in the order of the passage:
The passage has one direction. Leave no sign unused, and use none twice.
The inscription gives rules for arranging all eight discs into one left-to-right sequence, with each symbol used exactly once; the sequence may begin at any disc because the ring can be rotated. Players turn the discs in order around the keyhole, then press the central keyhole plate to submit their arrangement. A correct adjacent pair sounds a steady note and keeps the blue frame lit; a violated rule makes the frame flicker and gives a brief, distinct click, so the party can correct the arrangement without guessing blindly. If they submit an incorrect sequence, resolve the failure effect, then reset the discs. No check is needed to read the inscription or operate the mechanism.
The puzzle activates when a creature turns any of the eight bronze discs or presses the central keyhole plate.
| DC | Check | What it gives |
|---|---|---|
| 19 | Occultism | Recall Knowledge about the Quiet Archive or its traditions; on a success, explain that the lock tests an ordered ceremonial sequence and that its clues describe before and immediately-before relationships. |
| 19 | Crafting | Identify the mechanism's telltale feedback: a correct neighboring pair gives a steady tone, while a broken ordering causes a brief pulse. This does not reveal the full sequence. |
| 19 | Society | Recall Knowledge about the builders' ritual symbolism; on a success, clarify that 'leads' means comes earlier in the sequence, not physically above another sign. |
No hint given yet.
The eight discs settle into place and sound one clear chord. Blue light flows around the door, the keyhole turns by itself, and the stone door slides open, revealing the protected chamber.
The frame releases a harmlessly bright pulse followed by a concussive thrum. Each creature adjacent to the door takes 2d6 force damage (basic DC 19 Reflex save). The discs return to their starting positions, but the inscription remains readable and the party can try again. After the first pulse, the lock's warning tone makes later attempts obvious; it does not escalate damage.
The ruin's builders, the astronomer-priests of the Quiet Archive, made this lock to test whether visitors could preserve a sequence of ideas rather than merely wield force. The eight signs represented the stages of a ceremonial passage, from the first light of authority to the final fixed star. The door protected records they believed should be entered only by those who could read their method.
For a lower-threat party, reduce the failure pulse to 1d6 force damage. To make the encounter more challenging, have the discs reset only after an incorrect submission and require a DC 19 Crafting check to stop the reset for one round; do not obscure the written clues.
Treat the inscription as the puzzle, not a test of player memory. Keep a visible numbered sequence or let the players write the eight symbols on paper. A failed check should provide a clue or information about the mechanism, never block access to the artifact. Reward sensible physical approaches and do not require a check to turn the discs.
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