The Blood Angels Chapter and their successors mount a desperate defence of their home world of Baal from the predations of the tyranid hive fleet Leviathan.

After a brutal campaign in the Cryptus System fighting the alien tyranids, Lord Dante returns to Baal to marshal the entire Blood Angels Chapter and their Successors against Hive Fleet Leviathan. Thus begins the greatest conflict in the history of the sons of Sanguinius. Despite a valiant battle in the void around Baal, the Blood Angels are unable to stop the tyranids drawing ever closer, but their petitions for reinforcements are met with dread news. The Cadian Gate, the Imperium's most stalwart bastion against Chaos, has fallen. In their darkest hour, no help will reach the beleaguered Dante and his warriors. Is this truly then the Time of Ending?