That 'Above the three' line, possibly about the Magus Sisters which you have to fight on the way down to the Farplane? And their symbols aren't religious, just symbols, and presumably, you fight them under where their Fayth Statues used to be, like all of the other Aeons.

But I'm confused. Is the answer a place or the symbol itself? Or are you allowed tell?

So I'm gonna take 3 guesses if thats alright.

1: If its a place, that long twisting road down to the Farplane in Chapter 5.
2. If its a symbol, the Magus' Sisters symbols.
3. If its anything else, the Magus Sisters.

Hope thats alright.