So it's made very clear that Allomancers can be either Mistborn or Mistings - no inbetween. You either get one power, or you get all of them. However, it's also been stated that burning an alloy of lerasium and a metal makes you into a misting of that metal. So what would happen if you were to burn multiple, different alloys of lerasium - would all the investiture you burn compound and enhance one ability? Would they override each other, "wasting" the lerasium you previously burned? Would they merge and form a new allomantic ability entirely? Or would they have the intended effect and make you a "polymisting" of the metals that were chosen? Or, is it something else entirely?