An observatory account of the Horizon Custodian and the single far sightline it has kept clear since before the Fracture Wars.
The Horizon Custodian maintains the deepest observation in the Mirror Belt. Its instruments hold one fixed bearing on a point beyond the local horizon. The observation began before the Fracture Wars and has continued without a recorded change in target.
The surviving systems do not identify what lies on the bearing. The Custodian does not answer questions about it, and there is no proof that it knows what the instruments were built to watch. The target may still exist, may have changed, or may have disappeared long ago. The sightline has not moved to check anything else.
Much of the deep array supports this one task. Shutter Wardens open and close the instrument covers. Parallax Surveyors maintain positions from separate observation points. Mirrors are cleared, realigned, and repaired so nothing blocks the bearing. The surrounding machinery treats an interruption as a fault in an active observation.
The Custodian attacks anything crossing the line. Its Horizon Sweep turns through three measured sectors. Its Forecast Mark records one exact position and strikes that location after a visible warning. Moving away defeats that prediction because the Custodian attacks the recorded point rather than changing the result after the target moves.
When damaged, it activates Parallax Surveyors to restore the observation. During its final response it works faster, but its warnings remain readable. This is why Nhalu visitors call the sightline honest. The Custodian measures a position, shows what it will do, and accepts the result when the subject moves. It does not redefine every outcome as proof that its forecast was correct.
This does not make the Custodian harmless. It will use lethal force to prevent an interruption, and it places the continuity of the observation above the lives of people crossing the array. “Honest” describes the limits of its work, not the moral value of its priorities.
Stopping the Custodian would end an observation maintained for longer than the Relic Republics survived. Allowing it to continue preserves a sightline whose purpose and target are unknown. Any decision should begin with the facts currently available: the bearing is fixed, the observation is ancient, the target is unidentified, and the Custodian will not permit a person to cross the line.
