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>Roose is immortal though? Wtf is that, lol
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It's the idea that Roose Bolton has always been the lord of the Dreadfort, and has kept himself alive for thousands of years through dark blood magic that works through the taking the skins of his enemies and the leechings and whatnot.

The theory does have a certain appeal to it. Throughout the books, Roose never talks about any of his ancestors or relatives, besides a vague allusion to his forbears in one chapter. Not one mention of parents, uncles, nephews, nieces, etc. Only Ramsay, who doesn't become a Bolton until ADWD. Also, nobody knows anything that actually happens in the Dreadfort or on Bolton's lands when they're not at war. There's been a few mentions that the Bolton's are completely unassuming and quiet, until Robb Stark called in his banner-men.

The general idea is that eventually Roose is eventually going to kill Ramsay and "assume his skin," in the process making it look like Roose is the one who died, then live on as the Lord of the North under Ramsay's identity. It'd partly explain why Roose is so concerned with how Ramsay conducts himself in public; he's going to eventually live as "Ramsay", so he doesn't want a bad rep.

It's a common theme for the Boltons: Ramsay assumes Reek's "skin" when he's captured by the Stark's. Ramsay turns Theon into the new "Reek." It's like Roose and Reek have existed for thousands of year, with someone being transformed into the "Reek" role, while Roose physically lives forever.