DoD, p630 (same edition as yours, Tehol)
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In the earlier casting, p334, they are still tiles, made of various materials, and, If I Interpret Correctly (this should replace the more common IIRC in Malazan Forums ) they kept changing material, as though they weren't finalized (and I suspect they weren't)
That said, the magic clearly didn't disappear; Sinn, Grub and Icarium himself use the new warrens agains the K'Chain Nah'Rhuk.
As to a new Pantheon, I agree with Abyss. There may be ascendants, but no one worships them. Thus, no new gods. No gods, no "Pantheon"... yet