The Memory Prison was an idea that I intended as more of a role playable experience rather than anything else. It isn’t a physically dangerous trap. Nevertheless, it can pose serious peril depending on how the DM decides to implement it.
The Memory Prison is a cross between a trap and a collection of artifacts.
One of my favorite things to do when creating magical items is to take a familiar item out of the source books and re-purpose it while leaving the original function intact. The Immovable Sword in this case is exactly what it sounds like: a sword that also functions just like an immovable rod! Fun!
The utility of an immovable rod by itself is a thing of awesomeness, but imbue a different kind of object with that kind of power, and now you can start shaking up the formula.
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