So there is a purple triangle mark with a roman numeral IX (9) on it and it sparkles like the rips in reality that are from the Taken King. Its on the left planter at the bottom of the steps where you drop into the tower.
The Nine have made there presence known.
edit: I hadn't noticed it before but figured others had. Just sharing things.
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Yeah we know about it. Showed up last week when Xur arrived. Was gone when Xur left. Ha a IX on it. It's Xur's way of telling his hoes he's here and they better have his money.