I've recently discovered this sub and I'm quite fascinated by it. This is my first post so apologies if I missed some rules.
We are in the Dungeons & Dragons 5E universe. The Xanathar guild (from "Waterdeep: dragon heist"), lead by the Xanathar the beholder himself, is magically teleported under the town of Vallaki in Barovia (from "Curse of Strand").
When I say teleported I mean the entire dungeon/tunnels that constitute the beholder's lair in Dragon Heist, with the Xanathar himself and a lange chunk of his goons (let's say 25% of the guild, not just the goons in the book) that happen to be there at the time. The entire complex gets teleported under the town of Vallaki, without any villag

