“Give her your blood,” Klaus murmured to Rebekah, who wasted no time in opening her wrist and pressing it to the girl’s parted lips. He could see her mouth working, just barely enough to drink a few drops, but it would be enough. The blood of an Original vampire would bring her back to life, as long as it was in her body when she died.

She would be a vampire, and she would be motherless, but Klaus thought that was a reasonable enough price to demand for a Mikaelson’s blood. He had given the first vial away far too cheaply, but he was wiser now.

- The Originals: The Loss, Chapter 28