The End of Days — Thomas E. Sniegoski

Half angel and half human, Aaron has been charged with redeeming the Fallen, and the fate of heaven and hell rests in his hands. Now reunited with his father, Lucifer, Aaron must come to terms with his legacy -- and determine his destiny. Aaron's beloved is also struggling with her own angel/human heritage and what that means for her -- and their -- future. The two seek solace in each other and in founding a new safe haven for the Fallen now that Aerie has been destroyed. But with the evil Verchiel growing more vengeful at every turn, theirs is a destiny cast in the sinister shadow of the Dark Powers. And in a battle this epic, victory is fleeting, but defeat is eternal....