Ibara has the compact, weight-bearing proportions of a seasoned tunnel keeper, with a broad back and a careful, heel-first gait that tests every floor before trusting it. Her slate-blue skin has a fine, dry grain like weathered rock, and pale mineral dust gathers in the creases of her knuckles despite her habit of washing them. She wears her silver-black hair in a severe braid threaded with tiny ceramic seal-tags, each stamped with a maintenance date. Her gaze moves over hinges and lintels before it settles on faces. The unexpected detail is a tiny, lovingly painted wooden puffin pinned inside her tool apron, its bright orange beak polished smooth from handling.

Ibara is exacting about doors and generous with people who admit what they do not know. Routine steadies her, yet a true emergency makes her improvise with startling speed. She can be blunt when she thinks time is being wasted, then quietly patient with anyone frightened by the machinery she understands. She values evidence over rank, but takes criticism of her own work harder than she lets on.

For three decades Ibara maintained the pressure doors, heat conduits, and stone-lined passages of a deep-vault complex beneath the Frostmelt. Her work was routine until a sudden heat failure left Chamber Four cold and sealed. During the evacuation, she found a set of precise hand-marks cut into a wall she had inspected every season. The marks led to a passage no maintenance plan acknowledged. Ibara chose to stay behind and guide the last workers out through the failing locks; she got them clear, but the chamber's inner door shut before she could follow the marks farther. Since then she has worked to restore Chamber Four and learn who altered the architecture. She trusts the meticulous Phocan pilot Tervi, who has brought her supplies through dangerous channels, but their friendship strains whenever Ibara puts the vault before the people waiting outside it. Her former apprentice, Kask, now works for a surface heat office and insists the chamber should be abandoned. Ibara is still deciding whether reopening it would save lives or repeat the disaster.