|We must've been through hundreds of books already and we can't find him anywhere —|
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This practice range were located somewhere in the British Ministry of Magic, presumably in the Department of Magical Law Enforcement. When required, a storeroom could be booked by the Auror Office, and then be temporarily turned into a place where they could minister to their apprentices a prolonged series of practise sessions aimed at honing their spellwork as to enable them to fare better against more evasive foes.