Immortals - Klaus Mikaelson
Five hundred years ago, an immortal witch fell in love with a temperamental hybrid. It was an unconditional love, one that was intended to stand for centuries, but good things are never meant to last. Mikael, the Original Vampire and a hunter, killed the witch to provoke her lover, taking the one good thing that the hybrid had ever had in his life. What happened in the battle between them sparked the uncontrollable rage that he had kept hidden. There was no one who could save the world from his terror now, or so he thought...
A decade after her death, the witch came back to life once more thanks to her immortal nature. It was a surprise to her that she was alive as well as finding that her hybrid and his family had moved on. Now, she had a choice: return to him and face whatever demons he had made in his path of grieving, or stay hidden and create a new future for herself. It wasn't an easy decision.
Until now, the witch has stayed clear of the hybrid and he had never learned about her resurrection. That is, until Damon Salvatore calls on her to help save his brother from an unnamed vampire. Little did she know she'd come face to face with the now cold-blooded killer.