Wights are corpses reanimated by the Others (or White Walkers). When an Other kills a person, the person becomes a Wight. They have no purpose beyond serving the Others, and appear to possess only basic, animal intelligence.
Appearance[]
Wights look like corpses, except they have vivid, bright blue eyes.
Death[]
Wights are difficult to kill and must be burned. Because their organs and tissue are dead they do not die from wounds that would kill humans. They are a danger to the men of the Night's Watch.