Navchandi, Shatchandi, Sahashtra Chandi Yag

Navchandi Yagya, also known as Chandi Homam, is a Hindu religious ceremony and a form of worship dedicated to the goddess Chandi, who is a fierce and powerful aspect of the Divine Mother. This elaborate ritual involves the recitation of verses from the Durga Saptashati, a sacred text that praises and glorifies the goddess Chandi.

As per the legends, Mahishasura was a king having buffalo head. He was a great devotee of Lord Brahma. After many years of penance, Lord Brahma was finally pleased and offered him a wish. He has gone mad by getting the power and demanded immortality. His asked god Brahma that he should not be killed by a man or animal of the whole earth. God granted him this wish and told that only a woman will be the end of him. As Mahishasura has the power of immortality he attacked Trilok (the three worlds of earth, heaven and hell) with his army. He also tried to capture the Indralok which is the kingdom of Lord Indra).

They consulted with Lord Shiva and Brahma, Vishnu & Shiva combined all their powers together to give birth to Maa Durga. Maa Durga then fought Mahishasura over a time phase of fifteen days. During this time period, demon Mahishasura kept changing his shape and become different animals to misled her.