The Necromancer Who Will Defeat Heroes and God's

The Land of Pangea is shared by gods and their heroes among them is a goddess who has failed to manage her kingdom and now she is on the verge of extinction To save herself from destruction, she summon a human, Blessed with necromancy - a power to awake undead to summon the four dragons will he be able to save the goddesses and how will he defeat the other mighty gods?