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I was thinking about the interchangeability between breaths and stormlight and had a pretty big epiphany. Since it has been basically confirmed by WoB that Vasher is on Roshar because it is easier to get the investiture he needs to live, wouldn't he need to be able to draw in stormlight and take it in as he would breath? If so does he have a nahel bond? An honorblade? Has he figured out a way to hold stormlight other than the two ways we know of? I am positive that breaths were able to be passed between people fairly easily is because of the shard involved, Endowment, so I think something g similar wouldn't be possible on Roshar, making Surgebinding or an honorblade the most obvious way for him to live under the circumstance of a Returned