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Originally Posted by GTO2.0
Isn't this exactly what happened in that cave already? Like he stayed in dream world too long and got marked.
He got marked from the NK touching him while he was using his powers unsupervised (He went to the tree where the NK was originally made, where he found the army of the dead). The dead were able to enter the area he was in despite not being able to before because magic, so that's where the theory sort of came from. I even heard of people suggesting Bran crossing the wall would cause it to break down & fall.