Demon Prophecy

There borns a human girl who turns a demon at the appointed age.
The demons she turns is of an element.
Every three decades after the one before dies, is she born.
To live in solitude and to live in fate.
If a demon drinks her blood, the demon will gain in power.
If a demon kills her, the demon will gain immortality.
If a demon beds her, his clan will prosper.
No choice she has but to live in fear.
Not until she is treated as equal,
Will it lift this spell.