One of the most curious thing is ...the occularum are made of tranquil skulls.
But there's a ritual , the tranquil has to get posessed and then quickly killed.(They said posessed by a demon , but since demons and spirits are basicaly the same thing , I assume a spirit would get the job done)
With those skulls you can see really ancient fragment of keys used by ancient elves.
So errrr...what's the deal with that exactly?
What happens to Seekers is the same (without the dying business) and as a perk they can no longer get posessed , and have power over lyrium .
Now it seems the Seekers have no mages in their rank so it's possible it could have other effect on mages.
Such as being able to see really ancient stuff no one else can.But since some inviduals from Tevinter figured out part of the ritual and are not going through the ritual themselves, I guess mages can get seriously damaged .
We don't know if they were not mages, lots of mages don't discover their powers until their teenage years, but the Seekers seems to go through to rite young. Some could be mages without knowing it. It could even explain why the failure rate is so high too, it's not just the year of seclusion, maybe only "mages" ends up with powers after getting "cured" from the rite.
Cassandra end up saying it's just magic later in the game in a banter with Solas anyway. I'm much more interested in how this was discovered personally. Seems more like finding something when trying to do something else to me.
I also wonder about their evil alter-ego: The Order of Fiery Promise who want to bring the end of the world to cleanse it. They get destroyed and reborn over and over again though the ages, as if someone is keeping them alive in the background. They only show up in Cassandra's personal quest and it feels like we are going to see them again, mostly because they didn't need to be there, having the Red Templars and Lucius as antagonists in the quest would have been enough.
Also, when it comes to Cassandra's rare gift of affecting lyrium, I get puzzled. We learn that lyrium is organic in DAI and red lyrium spread like a fungus in a body. Solas call it all the magic in the world (minus the one done by mages) in a banter with Varric. Dagna claims mages all have natural lyrium in their bodies. I don't see how Cassandra could set it aflame, although Dagna's idea that lyrium is trying to flow somewhere might be that Cassandra just free it to do so.