Ok, things suck around here lately. So to liven it up, I'm posing the question: what DON'T we know? Immediate answers:
Who is the Summoner?
What's so special about Mazzarin?
What is the exactly nature of the Leveller and the other gods?
The latter has been rather cleverly answered by SD, so that leaves us with the big questions of the Summoner and Mazzarin, who I have previously theorized to be reincarnations of eachother.
Another Thoeri™: A lot of things seem to be revolving around a particular parallel dimension lately. The spiders, Fetch, and Callieach, the Devoid, and indirectly the Dwarves, Ghols, and Trow. It seems the fates of these two worlds are inextricably tied. Could this whole thing be somehow related to the "flipping coin" theory of long ago? With the Spider World being the dark side of our world, an underworld kind of thing?