Kateru is a lean tiefling woman with deep umber-red skin, swept-back black hair braided with small brass rings, and short, polished horns that curve slightly backward. She dresses with unusual precision despite long travel, keeping her coat brushed, her boots oiled, and her gloves spotless. Within moments of entering a room, she has usually inspected every exit, window, staircase, and unattended bag before looking directly at the people inside. A blue glass pendant hangs at her throat, glowing faintly whenever her emotions stir.

Curious, sharply observant, and socially fearless, Kateru treats every settlement as a puzzle of habits and hidden rules. She is generous with food, directions, and stories, but dislikes being treated as an exotic curiosity. She prefers practical kindness to grand declarations and trusts people who admit what they do not know.

Kateru Salk was born in a volcanic chain of islands far beyond the trade routes most mainland maps bother to name. Her mother served as a keeper of navigational shrines, and her father repaired instruments for ships that crossed waters believed to be haunted. Kateru grew up learning that every journey had a cost, every coast had a superstition, and every stranger carried a story worth remembering. Her sorcery first appeared during a storm, when a burst of wild magic turned the sea around her family's vessel briefly into black glass. The ship survived, but Kateru became convinced that the strange power inside her was connected to the old spirits her people warned travelers never to bargain with. She left home carrying a collection of inaccurate maps, a little brass travel flute, and a blue glass pendant given to her by her younger brother. Since then, she has crossed deserts, river kingdoms, and imperial roads, earning meals by telling embellished stories and earning trouble by testing local taboos. She now travels toward the interior, following scattered accounts of people who have seen the same black-glass sea in visions. Kateru suspects that her magic is not merely wild. Something, or someone, may have noticed her on the night of the storm and has been waiting for her to come ashore.