Ylvi has a blunt, slate-blue dragonborn muzzle dusted with pale flecks like kiln ash, and a ridge of short, backward-swept horns that catch soot in their grooves. Her broad hands are permanently stippled with tiny dark burns and glossy with beeswax from years of repairing bellows and leather seals. She smells unmistakably of hot clay, wet wool, and sharp clove oil, though she insists the clove is for keeping rats away. She moves with a careful, heel-first tread that makes her seem quieter than her heavy frame should allow. The unexpected detail is her habit of carrying a tiny folding paper theater and staging wordless puppet scenes for children during lunch breaks.

Ylvi is brisk and unsentimental when a task is urgent, yet quietly tender toward people who have been overlooked. She trusts evidence and skilled hands, but can become stubbornly protective of a failing place because she remembers who kept it alive. In company she deflects praise with practical questions; alone, she stages miniature puppet plays and worries over choices she has already made.

Ylvi was born into a family of ferry workers in the upland settlement of Cwmbrial, where a steep river made every crossing a negotiation with weather. At seventeen, she was apprenticed to the kiln crews at the old clayworks, learning to patch furnace bellows, set tiles, and keep a fire alive through a night of sleet. During the winter called the Nine-Day Smoke, a roof collapse trapped six workers in the kiln yard. Ylvi, then a junior hand, chose to break the outer furnace wall and flood the firing chamber rather than wait for the foreman’s orders. The ruined kiln cost the town a season’s income, but all six people survived. Since then she has trusted practical judgment more than rank, while privately fearing that one day her quick decisions will destroy something that cannot be rebuilt. The clayworks later closed, and Ylvi now repairs ovens, roof tiles, and smoke flues from a cramped shop near the ferry. She sends part of her earnings to her aging father, Rhodri, and keeps a strained friendship with former foreman Tewdric, who believes she should have waited for permission. Her immediate problem is that a developer is buying up the old works and plans to seal its collapsed lower passage, where Ylvi suspects the last kiln crew hid records proving the land belongs to the town.