Raphael is alone.
He is alone when they are created, each angel with their mortal soulmate.
He is alone as the others find their mates, their Chosen, and bond unto them.
He is alone as the ranks of Heaven swell with new angels, once-mortal souls bonded to the Holy Host.
He is alone as humans war among themselves, senselessly killing one another.
He is alone as "progress" causes death and destruction unlike anything he's ever seen.
He is alone during the final fight. No one guards his back.
And he is alone as the world ends. His vision goes black.