I am also having issues with the elegant arsenal quests. I am at 7/9 according to the triumph. The quests are not in the rite of the nine vendor nor in the abandoned quests vendor. I only have one character so no possibility of being on another.
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Hello there, Thank you very much for reaching out to us. I'm sorry to hear that you are having trouble with these quests. At this time, you have completed all of the available Elegant Arsenal quests. Please keep an eye out for further quests throughout the event.
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Only 7 of the quests are part of Elegant Arsenal.