"I think it's not very different from the ritual you participated in, fundamentally at least. A bit more crass, I'd say," I reply with faux cheerfulness. "Well, the bone of a powerful, magical ancestor. In the case of the Dark Lord, both Salazar Slytherin and Cadmus Peverell are possibilities. To save you the next question: He's already solved that problem by violating Peverell's grave to get the first ingredient for his potion."