Yatinath Avatar

But Aahuka consoled him and decided to give up her life by jumping into the burning pyre. Right then lord Shiva appeared in his real form and blessed her by saying In his next birth your husband would take birth in a royal family. He would become Nala and you would be born as Damayanti. I would myself appear in the form of a swan and help both of you to unite. After saying this, lord Shiva established himself as immovable Shivalinga, which later on became famous as Achaleshwar linga.