Tiruma are a compact, six-limbed beings adapted to the ventilation shafts, pressure corridors, maintenance ducts, and hidden atmospheric systems of Qualx. Standing roughly four to five feet upright, they possess two digitigrade legs, four long manipulative arms, clawed hands, and unusually dexterous feet. Their most distinctive feature is an exposed, lattice-like ribcage surrounding respiratory bellows, while short sensory fronts around the jaw help them interpret subtle changes in the surrounding air.
A tiruma does not breathe the atmosphere, they read it. Airflow direction, pressure changes, contaminants, mechanical vibration, and the rhythms of ventilation systems from an environmental language that tiruma can interpret with extraordinary sensitivity. They are natural climbers and confined-space workers, comfortably moving through ducts, along walls, and across overhead cables or maintenance structures using multi-point bracing and coordinated four-arm movement. Their biology makes them exceptionally valuable as pressure diagnosticians, ventilation technicians, filter specialists, maintenance climbers, and inspectors.