Tarsa has warm brown skin with a matte, sun-dried look and a broad, steady face framed by tightly coiled hair going silver at the temples. Her dark eyes move from hands to exits to faces with the rhythm of someone weighing risks. She stands squarely, feet planted as if every room might shift under her, and unconsciously claims more space than her compact frame suggests by laying out papers and objects in deliberate arcs. She smells strongly of bitter orange peel, lamp oil, and the mineral dust of anchor vaults; she knows it, and keeps a peel in her pocket to disguise the oil. The unexpected detail is that she is an accomplished paper-cut artist, making minute silhouettes of birds from discarded contracts.

Tarsa is patient with frightened people and impatient with careless confidence. She can be generous in private yet exacting in public, because she believes a promise is only useful if it survives scrutiny. When calm, she explains every clause; when under pressure, she becomes clipped and directive. Her humor is dry, and she dislikes being thanked for doing what she considers necessary.

Tarsa grew up carrying messages between Aethelgard's market courts and its old transit chambers, where caravans paid to have their route anchors inspected before crossing the Star-Sand. She learned to read stamped seals before she learned to read poetry. In her twenties, she certified an anchor that had passed every ordinary test; it failed during a dust crossing and stranded a convoy for three days. No one died, but the loss nearly ruined the caravan leader, her younger brother, and Tarsa's certainty that procedure was the same thing as safety. She spent years rebuilding trust by making inspections slower, clearer, and harder to buy. Now she is a senior factor at the Exchange Vault, where she protects its long-running anchor-certification business while quietly questioning whether its methods have kept pace with new magic. Her current entanglement is the casket: she wants to secure it, or learn what it can reveal, without allowing the Star-Sand route to become a battlefield or making the Vault look complicit in a dangerous secret. Her former mentor, Orvek, believes she is risking the institution for curiosity. Her brother, Dagan, still runs caravans and wants her to stop treating every business decision like a moral trial.