Here is my theory on god metals. In another thread I'm not going to link since I'm on a tablet, I propose that, among other things, burning a god metal gives a twisted version of one of the sixteen Allomantic metals, like electrum and atium. This is not confirmed by WoB, but I also think that an Atium Misting could burn any alloy of atium (assuming appropriate amounts of each metal, of course). Not only that, I also think (with even more controversy) that electrum Mistings can burn atium, and so on. I think Raysium (different name) might do something like aluminum, or maybe pewter, or something.