Thor/OC - Thor and Athena have returned to Earth, to the Avengers, in order to retrieve Loki's scepter...and found far more than they bargained for when a new enemy, Ultron, is created by one of their own. Forced to confront their darkest fears, Thor and Athena's strength and will shall be tested. Can they find the will to fight on when Ultron attacks? Fourth in the Heroic Hymns.