It appears during the weekend when Xur is in game. It's the mark of the Nine
English
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Just saw that in the forum...how long has it done that...? O.o
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Far as I know it has been there since Xur first started coming to the tower. I'm not sure I saw a post in the forums about it in July or August of last year. It's a definite mystery that I am sure Bungie will offer zero insight into for another year at least.