If you've played FFXI the teleport crags have 1 teleport crystal, 1 shattered crystal for promyvion entrence and 1 displacement (like our aetheryte nodes) to enter Al`Taieu all within steps of each other, so it's not that weird actually.
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I just examined it over on Besaid.
This is the skeptic in me talking, but I think it has nothing to do with recent events. Remember how sometimes someone would be able to glitch a retainer to appear in the adventurer's guild at the bell? This may be a glitched node for someone's guildleve.
Supporting that is the lack of a major "shiny" light flare at the top of the node, as what you would see at the actual main node itself in Nanawa. Real aetherial nodes have that shine.
The placement itself is also rather weird, since Nanawa itself is a mid-range underground cavern.
it is just a broken finished levequest glitching, nothing special. The animation is stuck, and it's happened before in many shapes
Saw it myself as I did a bunch of leves today
Where are these no music places so far havn't seen it. The rain thing I am seeing also got a disapated crystal from a spriggan
its still there as a node its through the doors to the left when facing the top of the map... its just there.... I and a lot of others have seen it
trade unaspected crystals to it and it will give you a random element materia
Here is one in Coerthas:
http://i51.tinypic.com/29wmhz8.png