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You want to have your mind broken? Then keep reading.
People have been asking, "how did Nihilego make itself look like Lillie?" The truth is: It most likely looked nothing like Lillie those entire 10+ years it was with Mohn. It probably looked like a younger Lusamine combined with what Nihilego thought Lillie would look like. Then, when Lillie and co. came into Mohn's cabin, it probably psychically read all of their minds, saw what Lillie actually looked like, then changed its appearance accordingly. Since Mohn was suffering from memory loss, he probably didn't even notice.
