Yulen has the dense, faceted body of a Pyrosylph, black basalt plates threaded with seams that glow like coals under ash. Fine grains of glass cling in the joints of his hands and rasp softly when he flexes them. He moves with a sailor's economy, always shifting his weight as if feeling for a deck's pitch. He smells strongly of hot stone after rain and scorched fennel; he knows it, and keeps a small tin of dried mint that does little to disguise it. In a crowded room he makes more space than he means to, his heat wavering the air around nearby cups and faces.

He is generous with directions and water, but guarded about decisions that could endanger a crew. In council he is patient with disagreement and impatient with evasion. At sea or on the dunes he becomes decisive and almost playful; after a loss, he withdraws into maintenance work rather than asking anyone to comfort him.

Yulen grew up aboard his family's harvesting skiff, learning to read dune edges by the way grit hissed against the hull and to find buried water by the taste of warm air. During a razor-sand storm, he piloted a stranded harvest flotilla to shelter, losing his left eye as shards tore through the deck and his crew hauled him back from the wheel. The rescue made him respected, but the flotilla's owners later tried to deny the crews their agreed shares. Yulen rallied rival captains around witnessed contracts and shared escort duties, helping the Sand-Skiff Union take shape. He now chairs its council while commanding the Glare-Runner, balancing the Union's independence against the practical need to negotiate with mining concerns. His sister, Oru, keeps his family skiff working and insists he still owes her a proper apology for leaving home without telling her. Tekk, a survey-master employed by a fixed mining concern, considers Yulen an obstacle and has quietly begun buying up access to several crater wells. Yulen's current problem is that the Union's crews disagree about whether to bargain, blockade, or abandon those wells.