Kaalratri is the seventh of the nine Navadurga forms of the mother Goddess Mahadevi. She is first referenced in the Devi Mahatmya. Kalaratri is one of the fearsome forms of the Mother Goddess. Kaalratri is traditionally worshipped during the nine nights of Navratri celebrations. The seventh day of Navratri pooja in particular is dedicated to her and she is considered the fiercest form of the Mother Goddess, her appearance itself invoking fear. This form of Goddess is believed to be the destroyer of all demon entities, ghosts, evil spirits and negative energies, who flee upon knowing of her arrival.
ॐ देवी कालरात्र्यै नम:
Oṃ Devī Kālarātryai Namaḥ
करालवंदना धोरां मुक्तकेशी चतुर्भुजाम्।
कालरात्रिं करालिंका दिव्यां विद्युतमाला विभूषिताम॥
Karalvandana dhoram muktkeshi chaturbhujam.
Kaal Ratrim karalikaam divyam vidyutmala vibhushitam.