After the Izanagi quest was fixed, I have a 'BLACK ARMORY KEY' quest in my inventory that I can not get rid of now. It is taking up a quest slot, and there's no way for me to get rid of it (I have already completed that quest step, and the entire quest). It requires me to have a Mysterious Box (I have 0/1) to do anything with it. I can't discard it or anything.
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Weird that I reported this twice but got no comment or confirmation... oh well, at least it's on their radar...