“Vinaya powder,” Elijah said, testing the lips and tongue. They were beginning to feel like they belonged to him again. “It was made to be a weapon. Against us.”

The other two fell silent for a moment, considering the implications of what he’d said. They’d all grown accustomed to being nearly invincible. Even injuries that could kill common vampires didn’t affect the Mikaelsons.

The very idea that something could have been created to destroy them felt wrong, dissonant with everything they had come to believe about the world. A White Oak stake could kill them and Klaus’s silver daggers could put them in a deep sleep, but there had never been another weapon that could truly harm them. Until now.

- The Originals: The Resurrection, Chapter 18