Hello peoples! I missed this thread and I haven't completely caught up with it.
So it's really awesome that you guys are talking about the Forgotten Ones, because I was just thinking about them. I was wandering about Thedas pondering the big picture and attempting to fit ill-fitting pieces of a puzzle together, you know like we do. It, not for the first time, struck me as so odd and strange that we do not have a name or anything at all for the Forgotten Ones. So I started putting together all that we know about them.
First I would like to ask that you to think of the Gods as more than single entities. They are the individual, but they are also their empires and nobles and accumulated power.
I would like to put forward that the Forgotten Ones were the slave caste/mortals.
1. More than once slaves have been referenced as "Invisible" in the game. I am thinking specifically about a codex in the Western Approach. Where it talks about how Magisters barely acknowledge their presence and only do so to punish them. To me, I think that is similar to Forgotten Ones.
2. Solas is remarkably anti-slavery. He has absolutely no tolerance for Dorian despite the Tevinter's repeated attempts to engage him. Honestly, his hatred of slavery is the most telling. Because his "grand plan" to help the slaves seems to boil down to "I don't know. Just free them." His heart seems to be in the right place, but his head is not. Real life history tells us how crap that plan is.
3. There is no number given for how many Forgotten Ones there are. This strikes me as especially odd since we know precisely how many gods there were in every pantheon.
4. Fen'harel is noted as being able to walk between both groups. It would hardly be surprising if Fen'harel had started out as a member of this caste only to be raised up to "godhood". Possibly as a result of the war he talks about with Blackwall. We have speculated to death about the wolf symbology and it's relation to warriors.
Now what happened to them? I think it is possible that they are right here on Thedas and Fen'harel sealed them away ... on this side of the veil as the elves we know today. To me it would explain why we never see any physical representations of the F.O. and why the elves seem to despise them while simultaneously loving the gods. We have seen time time again examples of ex-slaves who hate themselves and continue to venerate their masters. I think that it got warped over time and that is why the people hate the Forgotten Ones and Fen'harel.
Now I am not going to tie in the Void with this, beacuse I'm not sure. But I'd like to know what you lovely people think. I'm not sure I believe any of this myself. I'm just speculating.