Keth'ra moves with the patient, deliberate weight of a door being shut. Her petrified-chitin plate has a dry, ridged texture, its translucent amber inlays catching the blue-green funguslight like trapped drops of honey. A broad, ridged carapace rises behind her shoulders; when she turns, the overlapping plates click together with the sound of small stones in a jar. Her forearms are thickly armored, but her hands remain ungloved, dark and polished from years of handling resin seals, weapons, and stone freight. Within a minute of meeting her, people notice she checks the same amber clasp at her throat with one thumb whenever a conversation turns toward rebellion. For all her severity, she keeps a tiny sprig of silt-mint tucked behind that clasp, replacing it whenever the leaves dry out. She leaves an impression of heat, resin, and an authority that expects the corridor to make room.

Keth'ra is disciplined enough to make a frighteningly swift decision, yet she privately questions whether the law she enforces deserves its obedience. She is brusque with officials who hide behind procedure and unexpectedly patient with frightened workers who struggle to explain themselves. In danger she becomes decisive and protective; after the danger passes, guilt makes her rigid and exacting. She is not gentle, but she notices who has been left without food, light, or a safe route home.

Keth'ra was born into a lesser branch of the Warm Resin Houses, where a family’s standing was measured by the passages it could keep open and the shipments it could deliver intact. As a young retinue guard, she believed a firm patrol and a fair toll could keep the lower corridors peaceful. That belief broke during the Resin Flood at Latchway Nine. A cracked sluice released hot silt and resin into a freight passage while House factors argued over whose charter authorized the emergency gate. Keth'ra disobeyed the order to hold position, forced the gate open, and led trapped workers to safety. Her younger brother, Tselu, stayed behind to keep the handwheel turning and drowned before she could reach him. The Houses praised her courage, then used her breach of orders to make an example of the workers who had followed her out. She accepted command of an elite retinue soon afterward, telling herself that authority in a crisis is better than a room full of disputants. Now she polices the corridors and protects amber shipments with a ruthless efficiency that unsettles even her allies. She privately sends medicine and food to families whose names appear on her arrest lists, and she has begun to suspect that the House elders are concealing evidence that the flood was no accident.