Goddess Parvati expressed in different aspects
Several hindu stories present alternate aspects of Parvati, such as the ferocious, violent aspect as shakti and related forms. shakti is pure energy, untamed, unchecked and chaotic. Her wrath crystallizes into a dark, blood-thirsty, tangled-hair Goddess with an open mouth and a drooping tongue. This goddess is usually identified as the terrible Mahakali (time). In Linga Purana, Parvati metamorphoses into kali, on the request of shiva, to destroy an asura (demon) Daruk.
Even after destroying the demon, Kali's wrath could not be controlled. To lower Kali's rage, shiva appeared as a crying baby. The cries of the baby raised the maternal instinct of kali who resorts back to her benign form as Parvati.
In Skanda Purana, Parvati assumes the form of a warrior-goddess and defeats a demon called Durg who assumes the form of a buffalo. In this aspect, she is known by the name Durga. Although Parvati is considered another aspect of Sakti, just like kali, Durga, Kamakshi, Meenakshi, Gauri and many others in modern-day hinduism, many of these "forms" or aspects originated from regional legends and traditions, and the distinctions from Parvati are pertinent.