Matsyapurana 157.17

157.17

sa te 'stu vāhanaṃ devi ketau cāstu mahābalaḥ
gaccha vindhyācalaṃ tatra surakāryaṃ kariṣyasi //

After that, the complexion of Pârvatî instantly turned into a golden hue from that of a blue lotus colour Her dark skin was separated from Her body and transformed itself into the original form of the Goddess Ratri who stood aside, dressed in yellow and red, three-eyed, with bell in Her hands, and adorned with various ornaments Brahmâ then said to Ratri who was shining like the petal of a blue lotus "Râtri! you have become blessed by the contact of Pârvatî, and the lion, produced by the fury of Pârvatî, shall be your conveyance and it will be marked on your banner also. Go to Vindhyâchala where you would do the work of the Devas You will be known in future by the name of Ekâvaṁśâ. "Goddess! This Pâñchâla Yakṣa is given to you as your attendant He is well up in various kinds of Mâyâ One hundred thousand of Yakṣa attendants are following him"—13-18.