Endverse AU. Dean Winchester is dead. Castiel came across him after the assault in the hopes he could save him, but failed. Instead, he found Lucifer, and the archangel left Castiel with a terrible gift. Now Castiel is stuck waiting for the end of the world, hoping he can find a way to end it all, even if it means ending his existence.

Gabriel somehow survived Michael due to interference from Lucifer. Now he, along with the Winchester brothers, their allies, and what's left of the Heavenly Host must figure out how to stop Michael before their world falls to another world's Heavenly Host and humanity destroyed.