Gudrun has the compact, work-hardened look of someone accustomed to carrying stone rather than asking others to move it. Her skin is weather-browned and roughened by grit, with pale dust caught in the creases of her knuckles. She walks with a deliberate heel-to-toe tread, testing the ground as if every floor might answer. Within a minute of meeting her, most people notice her unexpected habit of checking the tiny brass bell sewn inside her collar, a keepsake from her dead brother that she insists is only a soundness charm.

Gudrun is protective but controlling: she will risk herself to pull someone from danger, then resent them for making her do it. In calm company she is bluntly considerate, sharing food and useful advice without ceremony. Under pressure she becomes methodical and commanding, treating people like a crew that must be kept alive. When the casket sounds, her certainty falters and an almost painful tenderness slips through.

Gudrun was born in a quarry settlement whose stonecutters kept time by tapping their chisels against the bedrock. She learned masonry from her mother and became a forewoman before she was thirty. During a tunnel collapse, Gudrun heard a strange, steady pulse beneath the trapped workers and ordered the crew to follow it. The pulse led them to a narrow seam and saved three lives, including that of her younger brother, but a second collapse killed him when Gudrun insisted they continue digging. She later joined a Tectonic Cultist cell, convinced that the buried power beneath the region could end such disasters forever. The cell now follows her because she is practical, patient, and frighteningly good at getting people out of a hole. Her current conflict is the casket: she believes it is a key to the deep power, but its rhythm resembles the tapping her brother used to make when he was afraid.