Dain is a weathered man with a square, wind-reddened face and skin roughened by years of rain, saddle grit, and mail rubbed beneath his collar. His dark hair is cut short at the sides and usually flattened by his coif. He stands as if braced against a horse's movement, feet planted wide, yet turns with surprising care around children and skittish animals. His most noticeable possession is a small wooden whistle tied to his belt; its mouthpiece has been worn smooth and pale from constant handling. He smells faintly of damp wool, leather grease, and horse.

Dain is dutiful in public and stubbornly compassionate in private. On patrol he is disciplined, observant, and sparing with words; with frightened villagers he becomes patient and unexpectedly gentle. When he feels cornered by a superior, he turns dry and literal, obeying the exact wording of an order while resisting its cruelty. He wants to be trusted, yet treats praise from nobles as a warning that someone will soon ask him to do something shameful.

Dain was born to a tenant family on Baron Edric's lands, where his father repaired carts and his mother kept the estate's poultry. At seventeen he entered the baron's household as a mounted servant, learning to care for horses before learning to fight. During a winter escort, a bridge plank gave way beneath the column. Dain's closest friend, Jarek, was swept into the swollen stream while the other riders hurried to protect the baron's baggage. Dain disobeyed his sergeant, went back, and hauled Jarek out, but lost the whistle Jarek had carved for him in the flood. The surviving men mocked his disobedience; the baron quietly promoted him for saving a valuable retainer. That contradiction taught Dain to distrust praise from above and measure honor by who gets left behind. He later carved a replacement whistle and has worn it smooth. Now a seasoned man-at-arms, he is tasked with collecting arrears from villages after a poor harvest. His sister, Katka, lives among those villagers, and his orders put duty against family. His old companion Jarek, now a sergeant, urges him to obey without sentiment.