Or it could be, as people mentioned, that the use of the mask was what awoke Fen'Harel in the first place. It did require blood magic to fulfill the ritual.
Did the miniseries actually say what they were attempting to do with it? What was their endgame?
Not really? I wasn't able to watch all of it because I don't think it's very good, but the sareebas (sp?) thanks Fen'Harel for the "tools" that he's being given, and then there's something about getting a lot of power. A rift opens up too but it closes when the mask is destroyed.
The whole series is weird and full of little errors. I find it super-odd that the Mask would even need elven blood magic to activate, since Fen'Harel doesn't practice blood magic. Most of the stuff with the Qunari is off-key. If Redemption is canon, it's canon in the way that Dalish legends are >.>
Hopefully they won't feel as stressed when we go north. I'm sure a few decisions down south will matter and a few people will matter, but they can probably get away with a few dialogue references for the most part. It would be tough trying to implement the Orlais ruler choice and Divine choice in a meaningful way.
They did get to pick what decisions to keep when they implemented the Keep. Hopefully they have a better idea of how to structure everything to give players enough choice to feel satisfied and not feel overwhelmed by the infinite possibilities. There weren't as many big results in DAI either. The mages end up about the same either way (the revolution ends, they're either in the College or in the Circle), same with the Templars, Seekers, etc. They're all sort of rebuilding. I think the choice of Divine is the biggest one in the game in terms of possible wide-reaching effects (aside from romancing Solas amiright).