The Witness cannot be seen directly.
Instead, it manifests as impossible angles in the environment.
Examples include:
corners sharper than geometry allows
hallways folding into themselves
shadows forming triangular voids
Looking at these shapes too long causes intense migraines and nosebleeds.
The Witness seems to observe rather than hunt.
However, individuals who notice its presence too often eventually disappear from reality entirely.
Perception Breach
Those who perceive the entity begin seeing it everywhere.
Geometric Collapse
Rooms may rearrange themselves when it becomes active.
Erasure
Victims vanish without leaving physical evidence.
Authority records of affected personnel slowly delete themselves over time.