Once, when the deities were defeated by Vrittrasur, they went to lord Brahma after hiding their weapons in the hermitage of sage Dadhichi. They requested lord Brahma to reveal about the means, how vrittrasur could be killed.
Lord Brahma advised the deities to male a weapon named Vajra from the bones of sages Dadhichi, as Dadhichi’s bones were even harder than the Vajra of Indra by the blessings of lord Shiva.
All the deities then went to the hermitage of Dadhichi in the leadership of Brihaspati. On being enquired about the purpose of their visit, Indra said that he wanted his bones so that a weapon could be made out of it.
Dadhichi gave up his life by his yogic power. Indra then instructed Kamdhenu to extract the bones from the dead body of Dadhichi. The bones were on given to ‘Twashta’ to construct the weapon-Vajra. Twashta took the weapons to Vishwakarma who at last constructed the Vajra.
Indra killed Vrittrasur with this weapon. When Suvarcha – the wife of Dadhichi came to know about the cunning deeds of the deities, she cursed them to become animals.