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Memory magic is a tricky deal under any circumstances and if the spell goes wrong, it can have terrible repercussions, personally and collectively.
The forces that govern Derleth are mysterious as they are powerful. Even if I had the capability to retain people's memories, I wouldn't want to try.
However, I have a theory that even if we forget our experiences here, our subconsciousness won't. The lessons we've learned, and the friendships we've made along the way will remain. They may reveal itself in unconscious decisions, or perhaps dreams, but the way minds work, what happens to us is never truly lost.