The range of a typical Finisterre creature's sending is "a stone's throw", but a "rogue" can send much further. A rogue is an animal that is sick or injured and pollutes the ambient with images of its distress. A nighthorse can also go rogue when it loses its rider and sends out desperate longings for companionship. Rogue nighthorses are a serious problem to humans on Finisterre because they can send their distress over entire valleys and this often spreads to other creatures like a contagion, making their behaviour unpredictable and dangerous. Humans are not immune to rogue sendings either. Riders and truck drivers have gone over cliff edges because a rogue horse has tricked them into seeing things that are not there. Rogue nighthorses have to be tracked down and destroyed.