Mythology (Story from Puranas)
When evil forces gained strength and got the upper hand and embodied themselves as demons and began to destroy the Dharma Setu (Bridge of Dharma). Rajas and Tamas were the most predominant evil qualities in them. They tortured the people in innumerable ways. In such a situation Shree Bhuvaneshwari, Divine Mother assumed divine forms with the names Kumari, Tripura, Kali and Durga and established the age old Dharma by destroying the wicked and protecting the good.
These facts have been explained in Shastras and Puranas. The above were fractional incarnations of Shree Mahadevi just like the incarnations Matsya (fish) and Koorma of Lord Mahavishnu. But Shree Lalitha Devi was the full incarnation of Shree Bhuvaneshwari. After coronation She was called Shree Rajarajeshwari. Her sacred story is as follows:
After the untimely death of his wife Gouri, Lord Rudra renounced all activities and started severe penance. Seeing this Kama the God of Love shot Rudra with his darts of love. Rudra in rage opened his third eye and burnt Kama into ashes. After many years Lord Ganesha made a human form with that ash and placed it before Rudra. Lord Rudra looked at it with compassion and an inert image became a living being. Nandikeshwara initiated him with the holy Rudramanthra. The ash born being repeated the mantra with implicit faith and incessantly prayed Lord Shiva (Rudra). Lord Shiva became highly pleased with him and blessed him with many boons. This being became famous as Bhandasura.
Later, after many years with the advice of Divine sage Narada the destitute Gods engaged themselves in meditation, worship and penance to make the Divine Mother manifest before them. They even got ready to Sacrifice their bodies in the blazing fire of Yajna. Shree Bhuvaneshwari in Manidweepa (Island of gems) saw the sufferings and penance of Gods and appearedbefore them in the bright form of Lalitha Devi, which is the full incarnation of Shree Bhuvaneshwari. Gods of heaven and Thrimurthis built a mahamantapa and a chariot for Shree Bhuvaneshwari with the help of Vishwakarma.
Brahma and other Gods assembled in the Mahamantapa and with just a look at Goddess Shree Mahadevi the things they desired was fulfilled. Goddess boarded her Shree Chakra ornamented with navaparvas. Shree Devi with her large army and assistants advanced in no time and arrived at Shonithapura of Bhandasura and encamped there. The battle raged. Within four days Bhandasura's brothers, nephews, relatives and ministers, army chief and large army died fighting against the army of Shree Mahadevi.
On fifth day Bandasura himself came and fought against Shree Mahadevi and died. All the three worlds again returned to peace and happiness. Shortly afterwards Hari, Hara and Brahma engaged the services of the sculptors Vishwakarma and Maya and got sixteen cities built in the Himalayan region and in other places for the stay of the Divine Mother. All these towns were called Shreenagar and Shree Bhuvaneshwari still lives in these sixteen cities and protects all the worlds from the evil forces.