My Grievous Fault (Destiel)

Castiel thought that losing his grace was the worst thing that could ever happen to him, forcing him to be mortal until he could once again become divine.

He was dead wrong.

There are worse things, things unimaginable to even him. As he runs from his actions and what he has done, he realizes that angry creatures are on the prowl and a man with green eyes might be his only hope.