The Warp Runners fought throughout the Great Crusade and still retain a number of Titans blessed by the Emperor of Mankind himself. Later, the Legion fought throughout the darkest days of the Horus Heresy, and participated in numerous engagements including the Battle of Tallarn. Legend has it that a battlegroup of Legio Astorum Titans was present at the defence of the Emperor's Palace during the Battle of Terra and ever since those dark days of the Great Betrayal, the Warp Runners have continued to faithfully serve the Emperor and His Imperium.