"That was my influence actually - I had all books that mentioned them purged, or confined to the Department of Mysteries," Harry sipped his pumpkin juice, "I was primarily responsible for managing dark magical artefacts that would otherwise fall outside of the Auror’s purview - items so dark or so dangerous that they couldn’t be exposed to the wider public. Horcruxes are the reason that that became my niche to begin with. What do you already know?"