There are three levels of illumination: bright light, dim light, and darkness. These are hazards.
Bright light lets most creatures see normally. Even an overcast day or a torch is enough to provide some bright light.
Dim light, or shadows, creates a lightly obscured area. An area of dim light is often a boundary between a source of bright light, and the darkness around. Soft light of twilight can also create dim light, as could a night under a luminous full moon.
Darkness creates a heavily obscured area. Caves, dungeons, and unlit nights are often filled with darkness.
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