The Claw of Dumat - future significance?

Whilst posting on another thread about Corypheus' loss of faith at the end of DAI, I started thinking again about the words of his servant.   Then doing a bit of searching on the net about the Claw of Dumat I found that other people had already made a connection between the object we see in the Fade and those we find in the Primeval Thaig in DA2, plus some smaller ones in other places we visit in the Deep Roads. So was this object elven in origin?

We know that the Evanuris, particularly Mythal and Fen'Harel but also Ghilan'nain, so may be all of them, were active in the Deep Roads.  So it is hardly surprising if we find elven artefacts there.   What seems more interesting is that Corypheus was using the Claw for a specific ritual that would give him access not just to the Fade but the Golden City.  How did he know that?  Presumably the voice in his head but may be he found some other tangible reference, like murals or something wherever he got the Claw from, which actually begs the question, where did he find it?

Corypheus also tells his servant that he knows about the connection between the ancient elves and the Fade and the fact that their blood is different as a result.    Now it is possible he already knew this from the numerous blood magic rituals that he had undertaken in the past, which showed the elves blood to be more potent.  However, the link between the elves and the Fade is clearly something he seemed to have learned more recently, possibly at the same time as he uncovered the Claw or may be something in the Archives of Tevinter mentioned the fact.   May be the Claw was held somewhere in storage having been found in ruins somewhere and he had only recently discovered its purpose.

Anyway, it hadn't occurred to me before but clearly he was taking a great deal of interest in things elven before he went to the Black City, so it wasn't an obsession he acquired only after being freed by Hawke.   However, I also realised that he said he was taking the name Corypheus only after he had undertaken the ritual and entered the City, although he asked his servant to start calling him that before.   I thought that Corypheus was the Tevene for Conductor, which was the title of the High Priest of Dumat according to Hessarian in the Canticle of Silence.  However, on checking my Latin dictionary, Coryphaeus means Leader in Latin, just as Evanuris means leaders in Elven and is the collective term by which Solas refers to the false gods.   So it would seem that he was going to take a title that equated with Leader only after completing the ritual that would take him to the throne of the gods, using the blood of elves and an ancient artefact likely associated with them. 

So what was the original purpose of the Claw(s) of Dumat?   It couldn't have been to enter the Fade physically as anyone could do that before the Veil if they didn't mind shedding their form whilst they did so and may be you didn't have to do that if you weren't going very far in.   So it must have had something to do with the Eternal City specifically.   The Anchor seemed capable of both opening and closing the Veil, so did the Claw have a similar purpose specific to the Eternal City?   If Corypheus used one to unlock a gate into the city, were they collectively originally used to lock the 7 gates into it?

So whilst we know the Idol is going to feature in the next part of the story, might the Claw also feature?   It is rather disconcerting that both items seem to require large amounts of blood, likely specifically elven blood in order to function for Fade entry but it only needs to be modern elven blood not ancient.  Could that be why Solas is gathering so many modern elves to him?