War Imposter: Charlatan

Use the Charlatan background, with the following additions.
When you joined the Karrnathi army near the end of the Last War, your life was not going well. Something in your past was haunting you so much that signing up to die was preferable to staying where you were. Then a miracle happened. You witnessed someone die who looked like you, and you suddenly had access to their life. You took their identity, and when the war ended you could let your old self go and become a new person.
The town of Salvation is the perfect place to start over as this new person.