As humanity advanced, the will-o-wisps were forced to learn to adapt. Automobiles made their favorite prey suddenly much more difficult to catch. Highways and GPS devices reduced flickering torches from guiding lights to mere curiosities that were quickly passed.
A few will-o-wisps still maintained traditional hunting methods, keeping solitary lairs in dangerous swamps and lonely mountain passes. But most banded together for survival.
It took effort and coordination to mimic the solid glow of a streetlight or to become a pair of distant taillights. But if they worked together, they could do it.
Humanity advanced, but their monsters kept up.

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