The Deep Stacks of the Sunken Archive
The Deep Stacks of the Sunken Archive
Read aloud
Cindreth's directions end three levels below the Sunken Archive's known excavation, at a seal no living scholar has catalogued. The seal is already open, and from the darkness beneath it comes the sound of stone turning against stone.
Run the session
Cheat sheet
Objectives
- 1Reach the uncatalogued depths
- 2Solve the shifting-sigil sequence
- 3Gain the cradle and survive the guardian's judgment
- 4Repel the Tribunal's seizure attempt
The clock
Veyr's strike team arrives during the retrieval, and Azkhar's army is already marching on Ravenbrook Keep. Each extended rest or major delay gives the army more time to approach.
Scenes
- 0:00Below the Engineers' Cut
- 0:40The Turning Script
- 1:40Seraphel's Judgment
- 2:55The Retreat Across Broken Stone
- 4:25The Inscription's Destination
Cast
- SeraphelOathbound guardian
- Archmage Cindreth ValeoreanQuestgiver and distant ally
- Veyr KallAntagonist
- Mara TernWitness
The hook
Set the scene
The known excavation smells of wet clay, lamp oil, and the crushed grain that clings to the canal engineers' boots. Mara Tern waits beside a stairwell newly exposed beneath the dig, its stone edges too smooth for the tools stacked nearby. Cindreth's final note ends at the stairwell's foot, where a circular seal hangs open on its hinges, its inner face scratched by something moving outward.
How Archmage Cindreth Valeorean asks
Cindreth sends the party with annotated rubbings and a hand-drawn route through the known excavation.
Her final instructions are a brief sending or written note: the old script describes a containment chamber, not a repository, and the party must not treat the cradle as a prize.
Rumours
Scenes
about 5 hours0:00
40 min
explorationThe table is here
1. Below the Engineers' Cut
V1, the canal engineers' known excavation, with timber braces, muddy walkways, and the new stairwell descending beneath the dig.
Mara Tern explains how the new stairwell appeared and points out the route through the familiar excavation. The party can inspect the open seal and find fresh scuffs on its inner surface, evidence that the mechanism opened from below.
NextA faint vibration travels through the stair treads, and the party follows it downward into air that grows colder and smells of wet stone.
0:40
60 min
skill
2. The Turning Script
V2, an octagonal junction where glowing sigils shift across the floor and walls, changing the apparent direction of the corridors.
The sublevel's wall sigils rotate in slow, interlocking patterns. The party must earn three successes before two failures using Investigation or Arcana checks. Describe how each attempt changes the markings; clever use of tools, spells, or teamwork may support a check. On two failures, the route still opens, but the ward pulses and the GM may apply a complication.
NextThe final sigil settles with a low ringing note, and a narrow passage uncoils beyond it.
1:40
75 min
social
3. Seraphel's Judgment
V3, the Cradle Chamber, where cold blue light glitters across a black-water shaft and the crystalline cradle hangs inside a ring of ancient script.
The party finds pre-Compact inscriptions and evidence that the chamber was built to house a vessel like the Nova's Heart. Seraphel appears beside the suspended cradle and asks each character, or the party as a whole, what they will protect with it. Accept a sincere Oath of Protection as a genuine commitment stated in the players' own words. Ownership claims or threats cause the wardens to attack at full strength.
The Cradle's WatchNextAs the cradle is lifted or released into the party's keeping, a distant impact shudders through the vault and sends ripples racing across the black water.
2:55
90 min
combat
4. The Retreat Across Broken Stone
A chain of narrow bridges above a flooded abyss, leading toward the known excavation through fractured pillars and buckling stone.
Veyr Kall and Obsidian Tribunal enforcers break into the chamber's approach regardless of the party's dealings with Seraphel. Veyr demands the cradle. The party can fight, bargain for time, or use the environment to block pursuit, but must escape while the bridges collapse in stages.
The Cradle's SeizureNextThe last bridge gives way behind the party, and they climb through the engineers' braces toward the daylight above.
4:25
35 min
social
5. The Inscription's Destination
The upper excavation, where daylight filters through a timbered shaft and the engineers' lamps sputter in the draft.
Once clear of the immediate collapse, the party reads the cradle's newly visible inscriptions. They identify Ravenbrook Keep and a sealed chamber beneath it, while Cindreth's response confirms the Seventh Nexus connection. Word arrives that Azkhar's army is already marching on the keep.
NextWith the keep's name fresh in the air, the party turns from the ruined stair and begins planning its route to Ravenbrook.
Behind it
What people believe
Following Cindreth Valeorean's research, the party explores a newly exposed sublevel beneath the Sunken Archive in Jorthiel.
They must decipher its shifting sigils, negotiate with the vault's guardian, and retrieve a crystalline cradle before an Obsidian Tribunal strike team can seize it. The inscriptions point toward Ravenbrook Keep and a secret beneath the keep that may change the course of the pursuit of the Nova's Heart.
Background
Long before the Dawn Compact, builders beneath Jorthiel's grain hills constructed a vault to contain objects capable of bending the world's magical currents.
The canal engineers' excavation exposed the Archive's upper levels, and the Gild-Way disruption has weakened wards that had endured for centuries. Cindreth Valeorean's research led the party below the known dig, where the inner seal has been opened from within.
The stakes
If the Tribunal takes the cradle, Azkhar gains an important tool for his campaign at Ravenbrook Keep.
If the party secures it, they gain a direct lead to the Seventh Nexus, but must act before Azkhar's army reaches the keep.
Encounters
2The Cradle's Watch
Combat, potentially avoidable through honest negotiation
A round chamber of black stone surrounds a suspended crystalline cradle. Narrow ledges cross a central shaft, with warding sigils inset in the walls and broken steps leading down.
Foes
Spectral Warden
ComplicationEach warden's first appearance carries a wave of dread. A creature that can see the spectral wardens must succeed on a DC 16 Wisdom saving throw or be frightened for 1 minute. A frightened creature can repeat the save at the end of each of its turns. A sincere oath accepted by Seraphel calms the wardens and allows safe passage.
ScalingFor a smaller or less capable party, use two wardens and have them disengage when Seraphel accepts the oath. For a stronger party, use four wardens and have one guard the approach while the others protect the cradle. Use suitable 5e creature statistics for spectral undead, adjusting hit points and damage to the party.
The Cradle's Seizure
Combat and fighting retreat
A chain of narrow stone bridges spans a flooded abyss. The route back climbs past fractured pillars, loose masonry, and ledges that can be used for cover.
Foes
Veyr Kall
Obsidian Tribunal Enforcers
ComplicationThe arrival is inevitable, whether the party has earned Seraphel's trust or not. At the start of the battle, the bridge begins to fracture. At initiative count 20, one section collapses; creatures on it must succeed on a DC 14 Dexterity saving throw or fall to a lower ledge, taking 2d6 bludgeoning damage. A creature can use an action to secure a section with rope, magic, or a successful DC 14 Strength check.
ScalingFor a smaller party, Veyr arrives with two enforcers. For a larger or stronger party, add two enforcers and give Veyr one additional use of a defensive or mobility feature. Use appropriate 5e humanoid statistics and give Veyr a custom, clearly magical force-strike ability if needed.
Cast
4Seraphel
Oathbound guardian, a spirit who tests the party's intentions
WantsSeraphel chose her oathbound vigil centuries ago to prevent the Nova's Heart, or an object like it, from being misused. She will entrust the crystalline cradle only to those who make a sincere protective oath.
“The Heart is not a prize to possess. Tell me what you will protect, even when protection costs you.”
Archmage Cindreth Valeorean
QuestgiverQuestgiver and distant ally
WantsCindreth wants the party to recover the cradle and learn how it relates to the Nova's Heart before Azkhar can exploit it. She provides research and remote guidance, but cannot accompany the party into the unstable vault.
“The inscriptions were never a map to treasure. They were a warning, and now we know what they were warning us about.”
Veyr Kall
Antagonist, Azkhar's agent
WantsVeyr Kall intends to seize the cradle for Azkhar and deliver it to the Obsidian Tribunal. He sees the party's arrival as a chance to take the prize without spending time deciphering the vault.
“Hand it over, and I may let you leave with the same number of limbs you arrived with.”
Mara Tern
Witness, canal engineer foreperson
WantsMara wants the canal engineers and her crew to survive the Archive's renewed activity. She knows the familiar excavation and can help the party orient themselves, but fears being blamed for the breach.
“We opened a corridor, not a door. The stone started humming, and then the lower stairs were simply there.”
How it ends
Rewards
Items
The Nova's Heart's crystalline cradle, a campaign-critical custom artifact component. It is not itself the Nova's Heart and grants no automatic combat benefit.
On a win
The party escapes the deep stacks with the crystalline cradle, whether by Seraphel's leave or through a costly forced retreat.
Its inscriptions confirm Cindreth's theory that the Archive predates the Dawn Compact and reveal the trail back to Ravenbrook Keep. Behind them, the bridges groan and sink as Veyr's surviving forces withdraw or fall.
What it leaves open
If it fails
- The party threatens Seraphel, claims ownership over the cradle, or tries to force the vault instead of negotiating sincerely.
- The party may still leave with the cradle, but must contend with the full spectral wardens and the hostile approach of Seraphel. The guardian refuses further aid until the party demonstrates protective intent.
- The party reaches two failures before earning three successes on the shifting-sigil puzzle.
- A failure costs time and may trigger a complication, but the party can continue by forcing a route through the damaged seal. The wardens become alert, and the final battle begins with less secure footing.
- The party is defeated or abandons the cradle during the retreat.
- If Veyr escapes with the cradle, the party can pursue him through the upper excavation or track the enforcers toward the surface. The Tribunal gains a temporary lead, and the next adventure begins with a recovery operation.
Complications (d6)
- 1A tremor drops a slab of ceiling into the passage. The party must clear it, find a detour, or lose 10 minutes while dust chokes the air.
- 2A ward-mark flares beneath a character's boot. That character must succeed on a DC 14 Dexterity saving throw or take 2d6 force damage and make enough noise to alert nearby wardens.
- 3A water channel bursts through a cracked wall, turning the next stretch of floor slick and difficult terrain until the party blocks or diverts the flow.
- 4A spectral echo repeats a party member's voice from a side passage, drawing one warden away from its post or luring an unwary character toward a dead end.
- 5The sigils briefly align into a false solution. The next failed puzzle check also triggers a pulse that deals 2d6 psychic damage to the character making the check.
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