mahishasur shows his respect to danu by offering her to sit on the throne of Indra...danu gets emotional to see the love and respect of her grandson mahishaur ...
she then asks mahishaur to sit on the throne of heaven...she was happy to see her life long dream coming true...
all the devtaas goes to the 3 Gods and plead them to save heaven from mahishaur ...
the 3 Gods Brahma,Vishnu and Shiva decides that even if they hv to fight a war with mahishaur they will fight it ...and release heaven from the clutches of mahishasur ...Ma Durga watching all this from her abode...
precap---------The 3 Gods asks mahishasur to leave heaven and hand it to the devtaas but he refuses and challenges the 3 Gods for war