Spectres of Death

It was a well known fact that the twin sister of the Boy-Who-Lived was a squib. That made the Hogwarts invitation all the more shocking. But Natalie has more important things to worry about; the forces of Death and Life are ready to go to war, and she must take her place as Death's Master and Champion on the front lines. AU Not Evil!Potters/Dumble, Slight Manipulative!Dumble