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I was researching Compounding and Twinborn and Feruchemy. Obviously I came across the information about Twinborn effects and that it's similar to what happened on Roshar with mixing the Surges (it's in Ars Arcanum for SoS and BoM). But it got me thinking: I get that mixing powers from different systems (one Allomantic and one Feruchemical) produces an effect because of interactions of Investiture... but how does it work on Roshar? After all, they have two powers, but those powers come from the same system! How can they be less subtle than effects of mixing different magics? And... since two Surges together produce and effect... How come people with ten (I know it's sixteen but they didn't use sixteen) powers from the same system (Mistborn and Full Feruchemists) had not such effects occur? I mean, Khriss goes on how mixing Allomantic and Feruchemical powers does create an effect, but not a single word about it happening earlier. She also says that it made her ver interested and she would not be if it was happening earlier. EDIT: I think this topic is pretty much exploited, so I voted answers up and down and marked a best one. Don't be upset by your answer being on -1; I voted them down because they're not contributing directly to the question - I'd also vote down some of my posts here if I could.