Ok. Look at this maps. This is "the world" (earth, hell, purgatory and paradise) as imagined by Dante .
From what we know, maybe the structure of the dragon age Cosmo could be somehow similar.
01) Surface /earth. Thedas, the material world.
02) Beneath the surface, you enter the "hell. The Deep Roads (the circles of hell), full of corruptions and darkspawns
03) even deeper into the depths, the "Well of Giants", the Titans.
in the Divine Comedy, in one of the last circles of hell, there are giants too. The first mention the giants are placed within a classical frame of reference, that of the mythological War of the Titans against the Olympians (elven gods? Evanuris?) This struggle, the Gigantomachy, culminated in the battle of Phlegra where Jove defeated the giants with his thunderbolts (Mytahl, see Solas Murals?).
From the titans, it originates the Lyrium (their blood), which seems to be the bridge between the Fade and the material world (how the lyrium, the blood of the titans, also ended up in the fade, bioware will have to explain in the next games)
04) Deeper, unreachable, the Abyss, the Void. Where the Forgotten Ones are sealed (Lucifer, Evil superpowerdul beings). Home of horrible things... and perhaps the place where the lyrium corrupts and turns red? The source and the hearth of the blight?
"
Here lies the abyss, the well of all souls.
From these emerald waters (the Fade?)doth life begin anew."
Probably the Abyss is somehow connected to the Fade too (if "emerald waters" is the substance of the Fade)
05) From there, you are somehow connected, through a long mystichal passage (
Budella), to the shore of the purgatory, with on the top, the terrestial paradise.
Could this be the golden/black city? A place connected both to the abyss (and hence its present corruption, the being turned black, empty, full of corruption, the blight?) but at the same time also to the metaphysical world of spirits (the Paradise/Fade?, hence its omnipresence of the black city in the Fade).
Wiki said that: Some accounts mention that the elven gods are trapped in the Eternal City at the heart of Beyond (so maybe the Black City is indeed a bridge/door between the Fade and the Abyss)
Something like the black tower of Stephen king, the place where "dimensions meet".
And if the black city has been (who knows when or why) corrupted by the abyss, the magisters entering (and then leaving) have brought the corruption of the abyss both in the material world and in the fade (via titan's blood? Currupted titan?)
06) The Veil, Solas creation, that separates the Fade from the material world
07) Above (in the case of dragon age, it would be more correct to say "all around" but in another, connected dimension) the Fade. Like the Paradise, house of the spirits (even not necessarly good ones) and souls of the dead
What to you think?