"Okay," said Luna. "You do that, then, and as soon as you can. Even with the Phoenix Fire it takes at least a day to get the furnace hot enough for us to start, so we'll need a lot of combustibles, particularly a special kind of coal that burns really vigorously. Harry knows where to find that. Then I'll have to ask him to pull out my memories, so that I can see what the exact configuration of runes and carvings were around the Veil Archway at the Ministry. That was part of the reason that he sent me to work there, I think, just so I could look in detail at the Arch, then he could extract my memory of it to study later. Once we have the brimstone, he can help me reproduce the carvings in it and then we'll be able to start the building process proper."