Hahah, that's the point I'm at, if it can be supported by any of the existing text, I'll go for it
Yeah, GRRM likes to write lots of stories set in the same world, he's done it with lots of books in the past. Including the Many World's series. I wouldn't be surprised at all if he wanted to do a separate series based in Sothoryos. I would love for us to explore there at some point, but I don't think ASOIAF has enough room for it. Fingers crossed
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