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We saw in Mistborn era 1 that Ruin was able to manipulate and change writing and even the contents of Copperminds. I wonder then, could a Feruchemist make their Copperminds safe by embedding them withing their body? Even if Ruin had the theoretical power to change what was inside them, the Investiture of the Feruchemist's body would make doing more that just wiping them seem unlikely.

What does copper compounding do? I don't think it's actually been mentioned, so if it hasn't feel free to speculate. Since copper stores memories that will then no longer for in your brain, might burning a coppermind permanently engrave them in your mind so you remember them perfectly but don't have to forget them temporarily to preserve them? Would those memories be corruptible by Ruin?