Hi everyone

I need some help in identifying a music track from Heavensward. Now I'm normally pretty good when it comes to identifying music in FFXIV and discovering their titles, but there is one track that dates back to patch 3.55 that still has me stumped.

I believe it was added for the remade version of the Diadem but as I haven't gone to the Diadem since before it was redesigned I am unsure. Either way, it appeared in the patch 3.5 trailer, found here around the 4'45" mark, during the scenes of the redesigned Diadem. As far as I am aware it is not on the Far Edge of Fate original soundtrack album surprisingly, which puzzles me even more.

If someone can help me with this puzzle I would be most appreciative, as I really like this music track.