Three Signals at the Summit

At the mountain's knife-edged summit, the tower rises from black stone while cloud streams boil far below. Three bronze pedestals stand on separate rocky spurs, linked to the tower by narrow ridges glazed with ice. Their mirrors tremble in the wind, flashing brief pale streaks across the sealed door. Each pedestal bears a turning wheel of worn symbols and a short inscription; the tower's three glass sockets remain dark, and gusts howl through the empty keyhole like a flute.

Puzzle · Level 4 · Moderate

Three Signals at the Summit

Cooperation, mountain navigation, and interpreting poetic clues

Read aloud

Say this

You emerge onto a summit ridge beneath a tower of black stone. Three bronze pedestals stand on separate spurs, their mirrors twitching in the gale. Across the gap, a circular door bears three empty glass sockets. A gust whistles through its keyhole, and the nearest pedestal answers with a faint metallic note.

Leading up to it

Each pedestal has a wheel with three symbols and a mirror that can be tilted toward the tower. A short verse is engraved beside each wheel. The ridges between stations are hazardous but passable, and the wind makes ordinary conversation unreliable. The tower door has a handprint-shaped hollow beneath its three dark sockets.

Pacing

Let the party examine the inscriptions and plan how to communicate before adding pressure. If they stall, show a correct mirror briefly lighting one door socket. After two wrong attempts, describe worsening gusts and offer a hint; do not make the weather a countdown that can erase their progress.

The room

What they notice first

The three stations are visible from the central summit, but each lies on a different spur and is separated by a gust-swept crossing. Their inscriptions are readable only by reaching them. Characters can shout across the gaps, though the wind sometimes swallows words; signals or deliberate relays work reliably.

WhereA high mountain summit with three separated ledges and a sealed tower entrance.

ThemeCooperation, mountain navigation, and interpreting poetic clues

Clear-Sky Station

When the white sea swallows the stone, I part the veil and show the height. Choose what gathers, not what burns; The summit opens to my sight.

Guiding-Wind Station

No hand can hold the mountain's breath, Yet one light thing rides where it blows. Choose what the gale can bear aloft, And point the way the high wind goes.

Night-Sign Station

When cloud and ridge erase the road, A distant spark can lead you far. Choose not the watching eye or crown; Choose the old and faithful star.

Door Inscription

Three far lights, one door. Set the signs, turn the mirrors, and answer together.

How it works

How to play

The party must reach the three separated stations, read each local verse, and turn its wheel to the symbol that best fits the verse. A character at each station tilts its mirror toward the tower and holds the setting; once all three correct symbols and mirrors are in place, the characters press the tower door's handprint at the same time. They can coordinate by shouting, gestures, or magic. Each correct station causes its corresponding glass socket to glow, providing clear feedback; a wrong symbol makes that socket pulse red. Require all three stations to be activated in the same round, but do not require initiative unless the party wants a tense timed attempt. Crossing a slick ridge calls for a DC 12 Strength (Athletics) or Dexterity (Acrobatics) check; on a failure, the character loses time and catches a handhold rather than falling to their death.

What sets it off

The puzzle begins when a creature turns a station wheel, tilts a mirror, or presses the sealed tower door's handprint.

Time limitThere is no hard countdown. The party may take time to plan. If they want additional urgency, a storm front can arrive after three failed attempts, raising the ridge-crossing DC to 14 without changing the solution.

Its parts

Clear-Sky StationA waist-high bronze pedestal on the western ledge, with a three-position wheel bearing cloud, flame, and mountain symbols.
Guiding-Wind StationA stone plinth on the northern spur, its wheel marked with a feather, a fish, and a bell.
Night-Sign StationA narrow shelf on the eastern ridge, its wheel marked with a star, an eye, and a crown.
Tower DoorA circular bronze door set into the tower wall, surrounded by three dark glass sockets and a recessed handprint.
Signal MirrorsThree hinged mirrors on the stations, each able to tilt toward the tower door.

Checks to ask for

DC	Check	What it gives
12	Investigation	Notice that each station's symbols correspond to the three images in its local inscription, rather than being arbitrary controls.
12	Arcana	Recognize that each mirror channels a separate magical beam and that the mechanism expects all three beams at once.
13	Perception	Spot a safe route between ledges, or notice the tower door's faint response when a mirror is correctly aligned.
12	Athletics or Acrobatics	Cross a gust-swept ridge or recover from a slip without falling; use one check per hazardous crossing.

What they can use

Symbol WheelsA bronze wheel at each of the three stations, with three distinct symbols and a detent that clicks into position.Use: Set one of the station's three candidate answers.
Signal MirrorsA hinged, polished bronze plate attached to each pedestal, currently angled toward the ground.Use: Reflect a beam toward the tower when tilted into position.
Glass LensesA shallow socket on each station containing a pale glass lens that brightens if its symbol and mirror are correct.Use: Provide immediate, station-specific feedback on a correct setting.
Door HandprintA worn bronze handprint inset below the tower door's three dark sockets.Use: When all three stations are correctly set, pressing it together activates the lock.

Solution

The answer · GM only

Answer key · GM only

Clear-Sky Station: Cloud. Guiding-Wind Station: Feather. Night-Sign Station: Star. Aim every mirror toward the tower and activate all three stations in the same round, then press the handprint. The verses are direct metaphors: cloud reveals the summit, a feather rides the guiding wind, and a star is the light that leads a traveler.

Cloud	The veil that parts to reveal the summit; choose this at the Clear-Sky Station.Sky
Flame	A tempting but incorrect symbol at the Clear-Sky Station.Sky
Mountain	A tempting but incorrect symbol at the Clear-Sky Station.Land
Feather	The light thing borne by the gale; choose this at the Guiding-Wind Station.Air
Fish	A tempting but incorrect symbol at the Guiding-Wind Station.Air
Bell	A tempting but incorrect symbol at the Guiding-Wind Station.Sound
Star	The distant spark that guides the traveler; choose this at the Night-Sign Station.Night
Eye	A tempting but incorrect symbol at the Night-Sign Station.Sight
Crown	A tempting but incorrect symbol at the Night-Sign Station.Rank

Other ways to solve it · GM only

A character can use a mirror, polished shield, or magically created light to imitate the three reflected beams, provided the party still identifies and activates the correct three symbols. This can substitute for positioning a mirror, not for choosing the right symbols.

A character with flight or a suitable climbing method can reach all three stations alone, but must still activate them within the same round. This avoids splitting the party without bypassing the puzzle.

The party can force the tower door with suitable magic or tools, such as knock or a successful DC 20 Strength (Athletics) check. This opens it noisily, causes the failure outcome, and does not count as solving the puzzle.

Partial progress · GM only

When it counts as failed · GM only

After

If they solve it

The three sockets fill with steady blue light. The tower door unlocks and swings inward, revealing a dry, windless threshold. The storm noise drops away as the apparatus continues shining, and the party gains access to the tower.

If they fail

Each creature on an exposed ridge makes a DC 12 Dexterity saving throw or is pushed 5 feet toward the nearest edge, stopping at a safe ledge if possible. A creature pushed to an edge can use its reaction to catch a handhold. The mirrors return to neutral, but no lasting damage is done; the party can try again after a minute, during which the gale briefly intensifies.

Rewards

The tower door opens onto a sheltered chamber with dry bedding, a working hearth, and a clear view of the mountain passes.

Inside, a brass astrolabe grants advantage on one Intelligence (Investigation) check made to navigate or interpret a map before the next long rest.

The tower contains a useful route chart or campaign clue tied to one of the party's current goals.

Where it leads

A map recovered from the tower names a pass where a missing expedition was last seen, and its route is only safe during the next clear night.

The tower's keeper was a former ally of the party, and one of the three station inscriptions has been altered in a familiar hand.

A rival climbing party is approaching the summit, seeking the same sealed archive and willing to bargain for help crossing the ridges.

The story behind it

The astronomer-priestess Maelis Venn built the summit apparatus to admit only a crew capable of coordinating across the mountain's treacherous ridges. Its three stations represent the conditions needed to find the tower in a whiteout: a clear summit, a guiding wind, and a visible star. For generations, her keepers used signal mirrors to open the tower before storms buried the paths; when the keepers vanished, the mechanism remained, still waiting for three deliberate answers.

For a weaker or stronger party

For a less hazardous version, remove ridge checks and let the inscriptions be read from the central summit through a spyglass. For a tougher version, add a storm gust each round after the party begins coordinating: each exposed character makes a DC 12 Strength saving throw or has disadvantage on their next ability check to cross a ridge. Keep the puzzle's symbol answers unchanged.

Tips for running it

Make splitting up a tactical choice, not a requirement: characters can relay signals, use magic, or travel between stations. The inscription at each station names the right symbol through a plain metaphor. Reward clever communication and safe traversal. On a wrong attempt, give specific feedback about which socket failed so players can refine their plan.

Check

What it gives

Investigation

Notice that each station's symbols correspond to the three images in its local inscription, rather than being arbitrary controls.

Arcana

Recognize that each mirror channels a separate magical beam and that the mechanism expects all three beams at once.

Perception

Spot a safe route between ledges, or notice the tower door's faint response when a mirror is correctly aligned.

Athletics or Acrobatics

Cross a gust-swept ridge or recover from a slip without falling; use one check per hazardous crossing.

Read aloud

Say this

Leading up to it

Pacing

The room

What they notice first

Clear-Sky Station

Guiding-Wind Station

Night-Sign Station

Door Inscription

How it works

How to play

What sets it off

Its parts

Checks to ask for

What they can use

Hints

Solution

After

If they solve it

If they fail

Rewards

Where it leads

The story behind it

For a weaker or stronger party

Tips for running it

Media

Turn Three Signals at the Summit into a sheet

Read aloud

Say this

Leading up to it

Pacing

The room

What they notice first

Clear-Sky Station

Guiding-Wind Station

Night-Sign Station

Door Inscription

How it works

How to play

What sets it off

Its parts

Checks to ask for

What they can use

Hints

Solution

After

If they solve it

If they fail

Rewards

Where it leads

The story behind it

For a weaker or stronger party

Tips for running it

Media

Turn Three Signals at the Summit into a sheet