Siddhidhatri Kavach (Siddhidhatri Kavacham) is a prayer dedicated to Goddess Siddhidhatri, 9th Navadurga aspect. During Navratri, Siddhidhatri Mata is worshipped on the ninth day.
Siddhidhatri is worshipped on the ninth day of Navratri – both Chaitra Navratri (Vasant Navratri) and Sharad Navratri (Ashwin Navratri).
Ninth day of Navratri is also observed as Mahanavami, Suvasini Pooja, Ayudha Pooja, etc..
Here are the lyrics of Siddhidhatri Kavach…