New Dungeon Concept - Mt. Gagazet - Sacred Mountain of Hrogar

[Shurrikhan]

I hate to ask but...you have a source? Any proof?
To my knowledge, and even my own research, its the Home to the Ronso, which is FFX & FFX-2
I see nothing about this being recycled from any other Final Fantasy Game

I can't think of what in 5 and 6 would be "Gagazet" or "the Sacred Mountain", even by another name.

North Mountain and Narsha, respectively, seem the closest, thematically, but they're still far from close.