He ignored it, but the sensation came again and something about it made his skin prickle. The interruption was annoying but, as he had been taught, he accepted it and carefully disengaged his mind from the growing gemstone. As awareness of his surroundings returned, he opened his eyes and looked around the cave for the source of the distraction. It wasn’t the stone-makers sitting nearby. They were glancing around in the same way as he was. He was fairly certain that it wasn’t the two magicians standing by the door, though their postures hinted that they had been talking. He’d learned to block out nearby conversations days ago. He listened, and realised he could hear a faint, low noise. At the same time he noticed that he could feel, under his hands, feet, and through the chair, a vibration. At once his heart began to race, and he quickly drew magic and surrounded himself with a strong barrier. A tremor, he thought.