The history
Old abrasion marks imply configurations predating the road crews. Those marks support a history of movement, not a verified account of construction or intelligence.
A presence in the world
Its hinges and stone supports require physical contact with the chamber. It cannot fold external mountains, create worlds or rewrite history.
Allegiance
Experimental bounded construct; maker unresolved.
Rivalry
Its rotation follows the Pilgrim’s completed crossings by one interval. Stopping an arch interrupts that pattern but makes no claim about which entity has authority.
The first encounter
The landing in front of you rises slowly. What seemed to be a doorway lifts on four supports, revealing another stair behind its empty centre.
Body and movement
Nonhumanoid walking architectural creature composed of three immense interlocking pale stone arches on four blunt jointed supports; an empty central volume, no face, no runes or orb core.
Ancient limestone, black friction marks, dust shed from articulated contacts.
Four blunt supports reposition before an arch turns. Dust sheds from the next active hinge, and the empty central volume remains a stable landmark during rotation.
Encounter design
Lock a safe route long enough to extract trapped surveyors and their evidence.
The arena
The same bounded Lacuna chamber, with three rotating arches, five marked landings and two accessible friction locks.
Phase 1
New neighbours
- Trigger
- The first surveyor tether crosses its central arch.
- Action
- An arch turns ninety degrees, exchanging two connected landings; hinge dust announces the turning side.
- Counterplay
- Stand on a marked landing outside the hinge sweep and cross only after the stone contacts settle.
Phase 2
Load rejection
- Trigger
- A friction lock is inserted.
- Action
- The construct raises one support and drops a short crushing load onto the blocked joint.
- Counterplay
- Leave the support’s shadow, brace the lock from the remote socket and use the unloaded arch to reach the second mechanism.
Phase 3
Held configuration
- Trigger
- Both friction locks engage.
- Action
- The remaining free arch cycles slowly to shed excess load.
- Counterplay
- Time the extraction through its empty centre, remove nonessential weight and leave the locks engaged until the last tether clears.
The cost of failure
An overloaded lock breaks and rearranges the route while the people remain on marked landings. Recovery requires a longer physical circuit; no character vanishes by unexplained fiat.
What remains
The chamber can be mapped in a documented held state. Long-term stability remains unproven and must not be advertised as a permanent portal network.