Author's name: fatalchild
Story link:
AO3
Artist's name: MashuraDi
Art link:
Tumblr
Rating: M
Summary: God is dying, and the world is going to end if he does. The only chance to save him requires the power of an archangel, but Michael is in the cage, and Lucifer, at first presumed dead, has lost his grace and his memories. Still convinced that Lucifer is their best chance against the Darkness, Castiel seeks him out and strives to protect him from a long list of enemies, even if that puts him at odds with his friends. What starts as battle strategy soon becomes more as Castiel is forced to contend with the difference between the stories told in Heaven and the Lucifer he’s come to know. The truth may hold the key to returning Lucifer’s grace, but Castiel doesn’t have a lot of time to find it.