Originally Posted by
Sicno
I think I know the part you're referring to. Meteion says:
"Like me, they feel his pain and turn dark...
That's only for Hermes, though. For others, they're always white and bright."
I honestly don't take that too literally because I find it entirely unlikely that the only emotion ever manifested in the history of the ancients is Hermes's sorrow. It could just be poor phrasing or interpretation during localization. The intention here could have been that even when they change color they remain a bright hue, like blue or green, and that they only go dark for Hermes. In an earlier quest he says:
"Though be it here or elsewhere, they are seldom seen in any hue save purest white..."
"(...) While it has no will of its own, it is sensitive to the prevailing emotion in the vicinity, and reacts by altering its color and vibrancy."
He doesn't say "it reacts to sorrow". He speaks about prevailing emotions, which also checks with what we saw earlier through he MSQ, that it changes to other colors because of different emotions, not just sorrow. So it must have reacted to other emotions too for the ancients. I know this contradicts what I said earlier about literal interpretations after localization, but if they would indeed have only ever reacted to him we could expect a more binary representation. Black or white. Joy or sorrow. Not hint at a spectrum of colors nor to emotions in general.