Siddhidhatri
Siddhidhatri or Siddhidatri is a form of the Hindu goddess Mahadevi, venerated as the goddess of siddhi. She is the ninth and last of the Navadurga, and is worshipped on the ninth day of Navaratri.
Iconography
The goddess is depicted with four hands holding a chakra, shankha, mace, and lotus. She is seated on either a fully bloomed lotus or a lion as her mount. In some pictorial depictions, she is flanked by gandharvas, yakshas, siddhas, asuras, and devas, who are portrayed as paying obeisance to the goddess.Legend
According to a legend, during the beginning of the universe, Shiva worshipped the unmanifest form of the great goddess, Mahadevi, to perform the act of creation. The goddess is said to have emerged from the left half of Shiva as Siddhidhatri. She is also believed to have conferred the ashta siddhi upon Shiva.Owing to her origin from Shiva’s left half, this form of the goddess is often associated with the composite deity Ardhanarishvara, in which the left portion represents Parvati.