Pyra looks like a dwarf rebuilt around a working furnace. Adamantine braces and compact clockwork joints replace much of her torso and limbs, their surfaces stippled with soot and fine tool marks. Beneath an openwork breastplate, a magma-core hearth pulses orange through a cage of blackened ribs, warming the air around her and ticking softly as pressure shifts. Her left eye is a multi-lens optical loupe that clicks through adjustments; the right is a steady, dark brown eye. She moves with economical, measured steps, then snaps into motion with startling mechanical speed. Within a minute of meeting her, people notice the sharp smell of hot oil and mineral dust clinging to her clothes, and that she seems entirely unaware of it. Unexpectedly, she keeps a tiny pot of pale cave-moss on her desk and tends it with the same exact care she gives a pressure gauge.

Pyra Steel-Vein is exacting and reserved, yet she is not indifferent to people. She shows care by preparing safe routes, remembering who is on shift, and taking the dangerous inspection herself. In technical disputes she is patient with questions and ruthless with unsupported conclusions. When frightened, she becomes more controlling; when someone has been hurt, she can abandon procedure long enough to get them out.

Pyra was once a gifted pressure engineer in the Great Nexus Valve, trusted to read the changes in a chamber's tremor before the gauges caught up. Decades ago, a reactor surge ruptured a magma conduit beneath a crowded service tier. Pyra held the manual bypass open long enough for the evacuation sluices to clear, then sealed the conduit with a hand-operated ram while the metal ran hot around her. The injuries nearly killed her. The Order of the Nexus Valve preserved her life through a difficult transcendence, rebuilding her body with kinetic grafts and a hearth-core. Since then, she has risen to Valve-Master and chief kinetic engineer. She maintains a wary professional bond with the Order's shift custodians, who rely on her judgment but resent her locked schematics. She is especially protective of the engineers who work the lower gauges, though she rarely tells them so. Now the Great Nexus Valve's pressure readings show a repeating disturbance that does not match any known fault. Pyra is trying to isolate it before political pressure forces a public inspection.