His sea star and Her dark lord- wtm

It's been two weeks since the second titan war against kronos and Cordelia and Tom are at home making their plans to get control of hogwarts when they receive a letter from hecate to go to hogwarts great hall immediately. when they get there they find the rest of the demi gods,some of their most loyal followers,the whole wesley family,the tonks family and members of the ministry.
Turns out that they are there to watch the past present and future of cordelia and all her secrets will be revealed for everyone to see, all thanks to her aunt hecate and the fates.

why does it always have to be her?

Cordelia hydra jackson-black is the demi-god daughter of poseidon and lyra black(fem-sirius) and the blood adopted daughter of James Potter.
she is also the soulmate to Tom riddle also know as voldemort.