Ok, here is my theory which sort of answers a lot of these questions, its pretty abstract too.
We all know that there are multiple worlds in this universe, the fetch and perhaps the spiders are from these other worlds. My theory is that the dark. So everything is going well untill Wyrd awakens from the one dream... how? I don't know, perhaps he himself is a son of the dark gods, or maybe came from one of thier dreams, but anyway he see's Nyx's world starts changing it into his dream-world (hence the wierd disc-shape). Now Nyx of cource gets very pissed off about this upstart changing his world, and so, before Wyrd can finish, confronts Nyx in a huge battle which Nyx wins. Then Nyx creates the trow to rule over Wyrd's suxy little planet. Wyrd, knowing himself no match for Nyx's wrath quietly plops down races at regular intervals, which all eventually get thier asses kiked 2 ketuki by the Trow. Finally, Wyrd makers the younger races which manage to avoid the Trow's attention, but grow in power and number till become a threat to them. The other gods, who usually don't meddle with eachother's planets (I'm guessing they're all really, really protective of thier worlds) start to get really woried about Wyrd, seeing how he has screwed Nyx's world so much, and combine thier power to shatter his one dream, then they create the Leveller to KEEL everything. Byx got so pissed off at them meddling with his world, and that fact that the Leveller doesn't exactly try to spare the Trow, that he defied the gods, becoming a rogue world-lord, though perhaps the term "dark gods" just meant lords from other worlds
Note: This theory also explains why the ghols (allied with the dark gods) and the trow (allied with nyx) fight eachother)
-Milk Man
P.S. A simpler explanation would be that the Dark Gods created Nyx to fight and defeat Wyrd, and then when Wyrd suceeded in creating the lesser races and having them prosper, they created the Leveller to defeat KEEL these.. but whats the fun in that?
