Detect Noise

A good thief pays attention to every detail, no matter how small, including faint sounds that most others miss. His ability to hear tiny sounds (behind heavy doors, down long hallways, etc.) is much better than the ordinary person's. Listening is not automatic; the thief must stand still and concentrate on what he's hearing for one round. He must have silence in his immediate surroundings and must remove his helmet or hat. Sounds filtering through doors or other barriers are unclear at best.