Devi Siddhidatri is the ninth form of Goddess Durga. She is worshiped on the ninth day of Navaratri. Siddhidatri has supernatural healing powers. In the beginning of the universe Lord Rudra worshiped Adi-Parashakti for creation. It is believed that Goddess Adi-Parashakti had no form. The supreme Goddess of Power, Adi-Parashakti, appeared in the form of Siddhidatri from the left half of Lord Shiva.
She has four arms and she is always in a blissful happy enchanting pose. She sits on a Kamal(lotus). She blesses all Gods, saints, yogis, tantrics and all devotees as a manifestation of the Mother Goddess. In ‘Devi Bhagvata Purana’ it is mentioned that Lord Shiva worshipped her and was blessed with all Siddhis (supernatural powers). By her blessings his half body became female and other half body male in the avatar of Ardhnarishvara. All human beings should revere Goddess Siddhidatri to achieve absolute perfection. Siddhi makes the person highly eminent and glorified. After obtaining Siddhi, human beings observe enhancement in their charisma. And this is only possible if one pays heartily adherence toward Goddess Siddhi-datri.