Seldom seen, this Stygian prefers to stick to her kingdom and jealously guards her treasures. She thinks herself a queen, and only leaves to add to her collection, leaving her daydreams (and a wide variety of traps) to protect her trove. 

Winning her over isn't particluarly difficult, just prepare a gift, preferably expensive, and layer on the praise. She'll love all those who pamper her daydreams- they deserve the best after all.

Steal from her, and she will waste no time nor resources to find the culprit and wring every last penny from them.