The party first met the spider, which wielded a violet scarf and seemed both protective and nervous, in 'white tiefling''s camp in Hunting Grounds. In the camp, there was a picture of the 'white tiefling' from long ago. He looked cleaner, younger, and more civilized. In the picture with him was a pale tiefling woman with a scarf similar to the one the spider had.
As it turned out during the fight to protect the Beast of the Hunting Grounds from the attacks of 'white tiefling', the spider was in fact pale tiefling woman. Which was discovered after the spider was crushed by vines and the tiefling woman lying there dead.