I really want to know what the last two metals are. I always thought the bead Elend ate was one of them, but perhaps they are just things of Preservation, not meant to be understood.
The metal chunk that Elend ate is intended to be something of a mystery. Much like atium, actually. Suffice it to say that atium isn’t, and never was, what people thought it was.
I intended Allomancy to be much like a real science. People investigate and put things into boxes, trying to describe and understand the world around them. That doesn’t mean they always get things right, however.
Let me say this, as I don’t want to spoil too much. If that metal Elend ate were fused into specific alloys with certain metals, it could have instead created Mistings of each of the different Allomantic powers. Atium’s abilities are not entirely explored yet either.
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