Zephrael is tall and spare, with the long, slightly stooped posture of someone listening through a floor. His opalescent robes shift from pearl to bruised violet with his mood, their hems frayed into papery threads that stir without a breeze. Silver hair floats around his head as if submerged. His mirror-black eyes reflect different scenes: a spiral staircase in one, a depthless void in the other. He smells unmistakably of rain on hot stone and faintly burnt sugar; he seems unaware of it. When he smiles, his teeth are smooth and pale as river glass, and his jaw moves with a soft clicking pause before each bite. The detail that surprises people most is the tiny wooden bird he keeps tucked into his sleeve, carefully repaired with bright red thread.

Zephrael is gentle with frightened people but evasive with the confident. He longs to be trusted and distrusts his own memories so deeply that kindness can look like a trap to him. When calm, he is patient and unexpectedly practical; when pressed about the erased verses, he becomes precise, then abruptly uncertain. His humor is dry and sometimes arrives several moments after the joke.

Zephrael once helped write the laws that held the upper heavens in order. He believed those laws needed imperfection to remain alive, and argued that a rule without room for mercy would eventually become a weapon. When the other lawkeepers erased four verses that allowed the laws to change, Zephrael helped hide their words in an obsidian dream-prism beneath the Spiral, a stairwell descending through the oldest foundations of the world. The act cost him much of his certainty about memory and truth. He was cast out of the celestial courts and has spent the ages wandering among mortal ruins, offering fragments of counsel to people he rarely sees again. His former counterpart, Tavrion, shared a tune with him; Zephrael still remembers its first notes but cannot recall whether Tavrion survived their final quarrel. These days he shelters in the abandoned observatory above the Spiral's entrance. A local archivist, Sesh, brings him scraps of written history and hopes to earn his trust. Meanwhile, a patient collector called Thessa is searching for the buried prism, believing its verses could restore a vanished city. Zephrael wants to pass the verses on before his mind unravels further, but fears that his memory has begun turning guesses into recollections.