I don’t spend an awful lot of time here talking about the back-story with Mare and Kelsier. I’ll get to more of it later. However, you know just about all you’re going to know about their failed plan. Kelsier thought there was atium in this room. They tried to sneak in. They got caught.
In a way, Kelsier is indeed reliving his last days with Mare by trying to break into the room again. He’s a Mistborn now, and he wants to accomplish now what he was defeated in earlier.
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