But it's much worse than it seems because Klaus has Elena's aunt Jenna. And to make it even worse not only did he have her in his clutches, but he also plans to use her as part of his long-awaited rebirth.
Where he would come back whole, and complete, no longer would he be only a vampire. But also a werewolf, he would be a being with all of the advantages of both species and none of the disadvantages.
One positive thing that the ritual would bring is as a werewolf he doesn't have to worry about being put to sleep by a silver dagger. Because as everyone knows when a wolf is hurt by silver it heals, and that's just one of the many benefits it brings. So now can you understand why he wants to complete the ritual so bad?
Completing the ritual he will be able to gain more strength and speed than his siblings, he may also be able to match his father in strength. And if that wasn't enough he would be able to make himself an army of hybrids, that will follow his every command like how a knight listens to their king. Even though it won't be by choice as everyone knows Klaus lives to compel people.
But before he can complete his ritual there is one thing he has to do. He has to kill someone he spotted a while back, and it's not just anyone. It's a vampire that almost matches him in age. He has no idea which of his siblings turned her.
But she must die, she was the reason Katerina was able to escape him 600 years ago and ruin the ritual.
Little did he know his actions would lead to the deaths of a multitude of supernatural beings. The person he wants to kill is someone Ivan loved so much, he was able to turn her into a vampire as his instincts were in control. He loved her so much he turned her in a way that can't be explained because she didn't even have a chance to drink his blood.