After slaying Ngư Tinh, Quân went down to Long Biên (). There lived a one thousand-year old nine-tailed fox called Hồ Tinh (, Vietnamese for "fox monster" or "fox spirit"). The fox lived in a deep cave, beneath Rock Mountain in the west of Long Biên. This fox often disguised itself as a human in order to lure the village men and women, then bring them to the cave and devour them. This fox has been harassing people from Long Biên to Tản Viên () mountain for centuries and the villagers were so afraid of the fox that they have to leave their homes and farms to other places in order to live peacefully. Quân brought his sword to the beast's nest and set out to slay the beast, just as he had with Ngư Tinh before. When Quân reached the cave, the fox smelt the scent of human flesh and emerged her lair to confront whoever it was who dared trespass into her domain. Upon seeing the beast, Quân then used magic to call the elements of wind and thunder to trap Hồ Tinh and after 3 days, the beast was weakened and attempted to flee from her attacker, but Quân caught the demon fox and decapitated her. Quân descended into the cave and rescued everybody that was still alive and returned them back to Long Biên.