HJG: You can measure purity in other things, of course. Factors of dilution. Contaminants. Our laws are written to accept the purity of a lineage as something similarly empirical. It’s just genetics, right? But—you can measure genetics. You can find a gene. In the course of my research, I’ve been discovering that every wizard who claimed to measure lineage purity—every single artifact that purports to succeed—they have all been lies.