Once upon a time, a demon named Arunaasura ruled the whole bhramaramba-devi-mataworld. Chanting Gayatri mantra, he performed Tapasya for a very long time, and pleased Lord Brahma. Arunaasura, wished that he should not be kílled by two feeted and four feeted creatures. Lord Brahma granted his wish.
With this wish of Arunaasura, Devathas were worried and prąyed Adi Shakti. She appeared and told that, Arunaasura is her devote and can,t be kílled unless he stops worshiping her.
As per the plan of Devathas, Brihaspathi(Jupiter), the Deva guru meets Arunaasura. The demon wondered and asked Brihaspathi the reason for his vist. Brihaspathi told him that, as both of them worship the same deity, the Gayatri, there is no wonder if he meets him. Arunaasura felt ashamed of himself for worshiping Gayatri, who is also being worshiped by Devathas and stopped worshiping her. With this Adi Shakti became angry and took the form of Bhramari / Bhramarambika. She created innumerable bees, which have six legs. These bees kílled Arunaasura and his whole army within seconds.