As told in Markandeya Purana and Shiva Purana, in the beginning of the Treta yuga, the Lord Narasimha, an avatar of Vishnu, killed the unruly King Hiranyakashipu by tearing up his body and drinking his blood. Because of the anger in Hiranyakashipu's body and blood Lord Narsimha drunk on rage and could not be stopped. To calm him down, Lord Shiva came down as Sharabha, a bird-animal-human hybrid. Upon seeing this, Lord Narasimha created Gandaberunda, a two headed bird to fight against Sarabeswara. These two beings fought a long time terrorising the world without reaching a solution. Seeing this Shakti invoked Pratyangira. Pratyangira appeared before these fighting beings and roared. When she roared, the terrified Sarabeswara and Gandaberund stopped their fight. Pratyangira had the combined power of Vishnu, Shiva and Shakti she was more powerful than any of them.