So, finished RoW, I did not read the halfs (yet?) Edgedencer & Dawnshard - instead I cheated a bit and looked up the summary for these (Dawnshard mainly) as I was too hungry for more “spice” of the SA story so I wanted to continue with next SA book straight away. I did read all of the current Mistborn series we have before SA though about a year or something ago

So I do have some notion about the...

shards, investiture and stuff but… I am still confused how the Cosmere magic works in general - I know that magic (Investiture) is different for each planet/system of the Cosmere and guessing it has something to do with the specific shards of that system… ?

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Well, if anyone wants to chime in with pointers I would be very thankful!
Meanwhile I will be scouring the wiki and WoBs to get a better picture.