i feel aside from the Gods that are only in roman mythology, islands will end up too similar to the greek ones if we do roman islands lol
Other than Odin, Thor and Loki we could add Surtr, Fenrir is being used elsewhere, Hela and i forgot the others name
Thats just basically one island for a ragnarok storyline.
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Japanese we could have the whole Susano, Amaterasu and etc.
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The Mesopotamian will have Tiamat, could just make it the final boss island with Bahamut, Leviathan