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I don't think the sword has any powers. It just seems like a big ass sword. If it had powers then it seems either Zabuza or Suigetsu would've said something about it and it would have a name like Samehada.
I believe that Suigetsu gets dehydrated quickly because his body might be nearly completely made up of water (he was kept in liquid form in Oro's lab) and he has to keep a large amount of water in his body at all times. Don't know what to think about that "hulk" transformation he did with his arm. However, that power may not just be limited to growing muscles, Suigetsu could have some shape-shifting abilites.
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