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Message: <blockquote data-quote="Shrapp Hamnier" data-source="post: 6889563" data-attributes="member: 6814107">(Formerly titled "lich bat-cave")I am making one of the ultimate bosses for my party to fight; a lich with an enormous hidden lair under a city. The problem is he needs it to BE ENORMOUS! He is storing hundreds if not thousands of corpses (including one of a dragon) in order to use for an undead army (I've already handled the issue of only being able to have so many undead at a time due to spell slot restrictions).My question is, what is the best way to hide this giant cavern, and the rest of his lair for that matter. It will have 3 parts, the main area for most of his studies (connected to a house in the city), the giant cavern area (where he hides the bodies and does more dangerous experiments), and a small room where he keeps his phylactery). Each of these 3 sections are to be concieled (he is super paranoid, it would take way too long to REALLY explain why his lair is under a city rather than in the middle of nowhere).Edit: I'm asking about the DOORS for these three main areas. How do I conceal them (with or without magic, but preferably with since it's a lich)? This is my second time as a DM, and the first time making my own boss lair that uses magic (I don't really even know how to lay magic traps, though I am having an easier time finding information about those).</blockquote>