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Message: <blockquote data-quote="Marshall Gatten" data-source="post: 6154087" data-attributes="member: 6705156">The reason my question about the cessation of the pocket space and things inside it is relevant is because it speaks to the previous points upthread about preparing the return area instead of trying to storm the Mansion. If a high-level caster knows that his quarry is in a Mansion, and he knows where the door is (within 20'), and he knows that anything in the pocket space will cease to exist at the end of the Mansion spell, then his best bet at a TPK might be casting Dimensional Lock centered on the door's area.It has a longer spell duration and so ensures that anybody trying to cross the threshold will be stuck in the pocket space until it ceases to exist. And, since the Lock exists on Prime Material, I'm thinking Dispel Magic cast from the pocket space probably can't reach it. (Dispel Magic doesn't mention any plane crossing.) So, instead of "How to get into a Mordenkainen's Magnificent Mansion" the question becomes "How do you get out?"So let's say you're in your MMM and you notice that the door won't open for you. Maybe you realize that it's because of a Dimension Lock on the other side, or maybe you don't. Regardless, how do you escape?If there isn't a good backup means of escape, then MMMs might backfire and become an extremely deadly trap.</blockquote>