Chandika Homa, Popularly known as Chandi Havan is one of the most powerful invocation of Shakti in the form of Maha Kali, Maha Lakshmi and Maha Saraswati.
In the Chandika Havan, all the 3 forms of Goddesses are invoked through the 700 shlokas of Durga Saptashati of Markandeya Purana.
It is one remedy to absolve several doshas and problems and gain infinite grace.
Gudanna is offered as ahuti or oblations to the 3 Goddesses.
Usually, 9 sumangalis and 9 kannikas are offered bagina considering them to be the avatars of the great goddesses themselves. The bagina includes all shringar items such as Kajal, bangles, Kumkum or sindhoor, mirror, comb and some grains are also symbolically offered to them with intention of seeking their blessings for abundance.
9 Priests chant the Durga Saptashati and offer oblations to the sacred Agni or fire.
The chanting of Chandika Paath is equivalent to chanting all vedas themselves and getting divine vibrations.
The Chandika paath is also said to absolve from Brahma Hatya Dosha, bless you with wisdom and prosperity and Karya Siddhi. It has the power to gain blessings of all Navagrahas -9 planets.
It is auspicious to perform the Chandika Homa during the navaratris that comes 4 times in a year.
It helps us conquer our own shortcomings or internal enemies. It bestows us with bliss, fulfils our dreams and desires, very beneficial to control ill effects of Rahu in our horoscope. It helps us gain siddhi or mastery over knowledge.