ElementalOverlord
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You could probably do something similar to the Northern Realms Fic and just have the OC rule as King in the North and have him expand his territory to the Iron Islands, Three sisters, Parts of the riverlands and lastly the True North. He could get with Val, Dacey Mormont, Daenerys Targaryen, and Maybe Rhaenys Targaryen if you want her alive.