The next day, under the guidance of Archbishop Brandon, Marvin came to the Magic Potion Warehouse of the Church of the Three Goddesses of Fate. To be exact, this place should be a small chapel within the Westminster District. It seems inconspicuous on the surface, but in reality, it is adjacent to St. Paul's Cathedral and the Demon Hunter Headquarters, with Scotland Yard Police HQ Station right next door. The security is extremely strict.
In terms of defense, this should be the second most important location after St. Paul's Cathedral. Magic Potion Ingredients are not as precious as Supernatural Items. Even if lost, they could be collected again, being consumable. The most valuable Supernatural Items are all stored in the treasure chamber of St. Paul's Cathedral, accessible only to the Pope and the three Archbishops—aside from the Goddesses and administrators.