So if you've payed attention; in the tower when you spawn in on the second to left pillar, the one with purple flowers there is a glowing symbol. What do you guys think it means?
Here is a side view: [url]http://imgur.com/KYHJj2S[/url] As you can see it glows.
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It looks like it could be what xur uses to get to the tower, since there is a "9" on the top of the symbol. It could work like instant transmission (I just randomly thought about dragonball), where you need a reference point to use to teleport to. (To get from point x to point y in an instant, you'd have to know where both the starting point and the ending point is first.) Also, don't ask how I got here. I don't know either.