The story about Fen'Harel and the tree's been really bothering me.
http://dragonage.wik.../wiki/Fen'Harel
This is the only story we have where one of the Forgotten Ones are not only named, but to some extent fleshed out, likely because it's told by an ancient elf. And just like Fen'Harel, Anaris is very different from how the Dalish portray the Forgotten Ones.
In legends they're just these malevolent shadows of the Void fighting against the Creators, because they're evil and the Creators are not. And yet, their roles are switched in Felassan's tale. We have Fen'Harel portrayed as a disobedient wastrel who hunts halla without permission, and Andruil has this rapist vibe going on with her forcing Fen'Harel to serve in her bed as punishment. And then we have Anaris, who's hunting Fen'Harel down for justice. Or maybe vengeance. After DA2 we all know how there's a thin line between the two. But if the Forgotten Ones are nothing but pure evil, then how come Anaris agrees to a duel with Andruil? Granted the duel didn't play out all honorably, with Fen'Harel pointing out weak spots and Anaris making use of it. Still, it's a duel nonetheless, an honorable gesture, when he could have just sliced Fen'Harel's throat and run.
Aside from that, Dalish legends have always said that Fen'Harel's buddy buddy with the Forgotten Ones. And yet in this story, which is probably much closer to the truth, Fen'Harel's their enemy. What if this is just another instance of Dalish legend being wrong, and Fen'Harel was never friends with the Forgotten Ones? He doesn't have to be friends with them to manipulate them into a position where he can seal them after all.
Been thinking about this, and see some possible metaphors in this story. Firstly, what we know from other sources is that Fen'Harel was clever, that Andruil spent time in Void (which was unusual enough to mention), and the Forgotten Ones originated in the Void.
So let us imagine that Fen'Harel pissed both sides off in an attempt to get the two most "reasonable" members of each warring faction to follow him and meet eachother at a neutral location - in the hopes of agreeing to a truce.
Now, Andruil making Fen'Harel her sex slave - perhaps we can choose to see the using of him as less literal. We know that eventually, Andruil came back from the Void driven to madness, and it has been speculated that this was caused by Red Lyrium, What if the deal struck between Andruil and Anaris for a truce involved Andruil handing over Fen'Harel for Anaris' justice/vengeance.... and Anaris giving Red Lyrium to Andruil as a "gift" (her not being aware of it's long term effects but enjoying its power for a time). So Andruil "used" Fen'Harel (hence "goddess of sacrifice").
So Fen'Harel objects and finds a way of wriggling out of being sacrificed... which unfortunately involves turning Andruil and Anaris on eachother and rendering the truce obsolete.
I see this as being supported by the presence of a tree - in "god" related allegories sometimes a metaphor for "division" - the seed, an idea of aspirations, become matured tree of a very different shape. Andruil ties Fen'Harel to this idea of division of aspiration and bittered experience, resigning herself to that fate when choosing to use Fen'Harel.