This music plays in Rancora Fortress, in Tiamaranta, and the areas right outside (e.g. Fissure Barrens, Adora Desert, etc.).
I love this one, it's so dramatic. It's like what you'd hear in a soap opera if the love interest dies or something. Beautiful, though, really.
Disclaimer:
I took all of the screenshots.
The music belongs to Aion, NCsoft.