Hmm...random names:
Mythraea
Hyperuranion (a philosophical term from Plato; has a nice ring to it though)
Protokinei (sounds Greekish)
Legioso ("legend")
Mythologos (with a hard 'g', more Greek, though a little too generic)
Logosa
Aethra
Logocaro
Middle-Earth?
Eden?
Pandora?
(All generic enough to avoid lawsuits, by the way. Even "Middle-Earth"; it's actually a translation of Midgard, a Norse mythological concept)
"Accretium" makes me think of black holes. But "Cascade" sounds appropriate, though perhaps plain English words might not be the best for this sort of thing.