How secure is a Magnificent Mansion?

[htetickrt]

Go the the Manual of the Planes. A rogue with the Gatecrasher prestige class can probably force open the portal into the pocket dimension where the mansion is located. If a Gatecrasher can force open divinely-sealed portals he certainly can force open the door to a magnificent mansion created by a mere mortal spellcaster.

Thanks, never thought of that. A few levels of gatecrasher might go well with the divine seeker from part IV of the adventure.

Then I guess they'll have to fight smarter. They know that (basically) every fight they'll have a reprieve of 8 hours. Work out something they can do in 8 hours to make the PC's back off.
Stoneshaping the place so there's no entrance to the ritual site would be a good one.

I find andargor's logic pretty compelling regarding opening a mansion in a forbiddance, and I've just told my players that it won't work (I don't really want to punish them, and the sorcerer would surely know this ahead of time), but the stoneshaping idea is a good one, and I may just yoink it for part IV, in which there is no forbiddance to worry about.

Thanks!