Kaalratri Devi is Maa Durga’s seventh avatar. it is one of the most ferocious forms of Goddess Durga.
When the dreadful demon Durgasur had to be vanquished, Goddess dispatched Kaalratri Devi as her special ambassador. Kaalratri Devi’s exhalation caused chaos, resulting in massive fireballs that annihilated the demon’s army. (Details are provided under Durga Devi.) Kashi Khand says that Durga Devi guards Kashi in the shape of several Shaktis/Devis at various locations in Kashi after conquering the demon and taking the form of Durga Devi. One of them is Kaalratri.
Her skin is pitch black, just like the dark. Her hair is tangled. She wears a garland that sparkles like lightning around her neck. She has three eyes that are spherical like the universe and constantly emit lightning rays. She regularly exhales fire flames through her nostrils.
On the seventh day of Shardiya Navratri, Goddess Kaalratri, the seventh incarnation of Goddess Durga, is adored. According to mythology, Goddess Kaalratri’s figure is portrayed as having pitch-black skin that resembles darkness, disjointed hair, a skull garland around her neck that shines like lightning, three round eyes that resemble the universe, and light that constantly radiates from her eyes. Through her nostrils, she continuously exhales fire flames.
Although she has a fierce aspect, she always bestows favorable blessings on her worshippers, which is why she is thought to be a Shubhkari. Devotees are free from all kinds of fear due to her blessings.