Harry Potter is just your average fifteen almost sixteen year-old wizard...until he isn't.
The idea is that the blood wards attack any "dark" magic/creature
*on Harry's sixteenth birthday he comes into a creature inheritance that is "dark" in nature
*The blood wards attempt to eliminate the threat to Harry not knowing The creature registering is Harry himself
*with the strain from the blood ward attack it starts to crack Harry's core...which is "torn asunder" when Harry attempts to escape by apparition
**bonus. Points if add Remus into story as mentor