Yeah but that's from the very early game...the first time Orion enters Eternum. And after we free Calypso we never get an update on whether Eternum considers the 3rd weapon "found" or not. Which should be a simple as asking Idriel whether it is "found" or not. In chapter 5 the party still discuss the matter of searching for the last weapon of Atlas...which presumably indicates that the Calypso we know is not it. But it is only briefly talked about. Not much there to go on.
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