 After being driven out from Svarga, or heaven, by the serpent king Vritra, the Devas needed a powerful weapon to aid their fight.By making use of the vajra, made from the sage Dadhichi's bones, the Devas defeated the Asura and reclaimed heaven.Dadhyancha or Dadhyanga in Sanskrit is a conjunction of two words Dadhya (curd) + anch (parts), which means "body parts taking strength from Curd."