Legacies aren't what you might think they are. Half-blood hare rare nowadays in countries that aren't America, not to say there aren't but the balance is quite thrown off and the monsters rage without the eyes of the gods.
Because of that the world evolved, the concept of demigod did. In Europe you can be claimed even if your parents are mortal. Or to better say if they're demigods, if they are legacies and you present powers? You are a legacy. This is my story as a legacy and a child of a miracle.

If you think you're one of us, don't worry we'll take care of you as best as we can, which to be truthful is quite a lot.
Every legacy has training at some point, mostly by the family, and then lots of us serve as soldiers in the local demigod patrol to keep monsters at bay. Then they retire and life a normal mortal line usually with other demigods.
Others are chosen, for prophecies, for a longer period of work, for special works. Like me.
We heroes fight monsters all our lives to ensure other demigods have it easier and trust you don't want to be one of us. Is it fair? No, but few things in life are.
My name is Damon Diana Flusso and the is not a nice story.