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So if we both have one, and one gets discarded it doesn't go to chamber?
Duplicate Cards No player may control duplicates of a unique character or cause them to fight each other. This includes unique characters in play, in battle, in a side battle, face down, or in a set-aside area.
Odd. However, I bow to the rulings of the Elders.
Water Jar would reveal all nine, put the Lost Souls in play, and put the duplicates back on top in the order they appeared. Not sure if the duplicates go back before the should go to play but I don't think it matters.