Here's a couple more, although they are more culturally inspired.
(5) If the Dwarves shot their homeworld onto Vyn (namely, onto Nehrim's Fold Valley), why are they not the ones reviled and Aeterna are (note that they are not just persecuted by Barateon, they are hated in general on Nehrim). I love Dwarves but it did strike me as weird.
(6) In Arktwend, there seem to be some elf-type characters, notably the leader of the Thieves' Guild and the Ranged Weapons trainer and at some point, one comes across the ruined kingdom of the Shadow Elves, apparently destroyed in a war with Demons. On Nehrim, there are only Aeterna and then only fair-skinned ones. What is the relation between these races, if any?
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- (7) Barateon became Chancellor of Erothin in the Year 1 After Treomar and Nehrim's action takes place in 1017 A.Tr. So, Barateon is over a thousand years old. We learn that Arantheal is immortal because of his divine blood. What of Barateon? He did it with magic? If so, it seems a bit odd that such a powerful wizard would not have more of an iron grip on his continent (since he wishes so).