Track one of the TERA OST.
Not sure exactly when this plays in the game, if at all. but it is a wonderful piece, nontheless.
It gives you the feeling of a large scale happening. Imagine opening your eyes, and you are overlooking the battle scarred landscape outside of Zulfikar Fortress. But you are not alone, the comrades and allies you have gained along your journey are here with you.
The very air around you shifts, you can feel a static charge pulling at you. Ne Nexus is opening.
You Steel yourself, cast a knowing glance at your friends and motion that the time is now! The Argons will not have their way any longer! They will not have Zulfikar!
Hehehe. I’m a sucker for stories I suppose.