Awareness

Awareness helps sharpen your senses (hearing, smelling and vision) to the point where you are more likely to note suspicious goings-on in your immediate surroundings. Terrain will play a small part as well in the sense that you may find it harder to discern movement in a dense forest than in a cave.

Mastering awareness at your ranger guild can help you see even in the poorest of conditions. (95% awareness allows night-vision)