 God of War : Ghost of Sparta was first released in North America on November 2 , 2010 , for the PlayStation Portable . Set between the events of God of War and Betrayal , Kratos , the God of War , is still haunted by visions of his mortal past and embarks on a quest to discover his origins by finding his mother , Callisto . He learns that his brother Deimos was taken by the gods and imprisoned by the God of Death , Thanatos , and decides to find and save his sibling . Although successful , Thanatos engages the brothers in combat , and kills Deimos . Kratos then kills Thanatos and returns to Olympus , further enraged at the gods . 
