Rabastan Lestrange's

Rabastan Lestrange was happy with his life. Until he became the Fidelius Keeper of one of the former Lestrange houses. After that, his life changed dramatically. He began to learn everything. Everything. But no one freed him from his duties as a Death Eater. That is, you throw Dark Spheres at Aurors and Muggles half the night, and then do homework half the night. And he had already graduated from Hogwarts!

He really wanted to ask the Lord for a Time-Turner, but Rabastan held out for now. But it would be fine if he only studied. They demanded that he use this knowledge! Nessie, how much is in this word... And not only in the word. The Lord is busy, who will feed Nessie? Rabastan. And the fact that this creature had already eaten two house-elves who used to feed her—no one cares. After all, the snake is smart—she does not touch people, but everything else... Nagini, for example, teleported straight from her mouth. True, after that, the Lord gave Nessie a suggestion, and she calmed down a little.

When it was necessary to build something, they called Rabastan again. Waved a wand and a house appeared? It is possible if you are Merlin. Rabastan would not be able to handle such a volume of transfiguration. But even if you make a house like that, it will collapse. You need to look at what kind of soil, determine its mechanical properties, choose the depth of the foundation, drill the soil for the piles, throw in stolen—I mean, cement bought from Muggles—mix it correctly with water and sand to get concrete of the required strength. So he felt like a team of Muggle builders.

He tried to talk to the Lord, explaining that a swamp in an unknown place is a bad location for a house (and also to deepen the piles, which would increase excavation work and the volume of concreting), but the Lord did not listen to him. Why does the Dark Lord need a two-story house made of a 10x10m square? It is not enough! Although it is good—less work. He could still understand why they needed a separate 1,000-square-meter ritual hall nearby. After all, we are not Mudbloods to live in a house without a ritual hall.

He could understand why they would surround it with wards and bind his father with a Fidelius. But there was something he did not understand. Why did they dig a cave under a Muggle cottage village? Why did they equip it with air regeneration systems to contain wizards? And why was he making exactly the same cave under this house?