"Alchemists who stick only to the earthly practices merely chase the transformation of base metals into gold, of the creation of the Elixir of Life, and of the making of a Philosopher’s Stone," Narcissa explained. "But Harry’s is a more spiritual path ... and his full union with you will represent the completion of his Opus Alchymicum. He would, in a metaphysical sense, become a Philosopher’s Stone. Or, more precisely, you both would ... together.