A few things. First of all: Hi!
Secondly, we have the means to create followers...sort of. We will require some 'raw materials.' Polymorph Any Object has a permanant duration when used to transform within a 'kingdom,' say, from animal to animal...that's how Silhouette created a werewolf from a fey wolf that she chased here from Faerie. Of course, that's the raw mechanical explanation...the game world will reflect it as something more poetic.
Sil also has access to Miracle, which can in theory accomplish nearly anything...albeit at a price in xp, and with GM oversight.
More importantly though, these aren't domains everyone has, and so we need some way for everyone to get followers. I can think of a few ways. One would be to simply rule that in these primordial times, the gods have powers to shape the world that go beyond the Rules As Written, and that so long as what we do is in concept, it can be done. The world is, now, as hot steel...ready to be pounded into shape. Once it 'cools,' the powers of the gods contract a bit to match the rules.
Another way would be some kind of quest. Like, Lavaria wants fire giants. She needs to go mingle with the Titans, ferreting out those who are willing to change, and working out a way to convey them to the world's firey center.
Another way is...unintended accident. Sort of like Silhouette, sometimes the actions of gods have consequences that they themselves don't expect or plan for. Perhaps Duretep discards some of his 'popcorn,' and accidentally creates a fertile species of edible plants, ready to sustain humanoid life. Maybe some fragment of the One/Many drops off and achieves independent sentience, then begins to spread out in colonies of Formians on its own. I already plan for Silhouette to 'accidentally' become the origin of lycanthropy in both its natural and cursed forms.
As for separate threads, I think that could work, with some effort. It would save some headaches as we don't have to follow multiple, mutually independent stories through one thread. It makes interacting a bit trickier...but in general if we interact we'll either be in the Grey Mist thread, or one of us 'guesting' in the thread of someone else....so it could work. Lets just keep posting in OOC to make sure we all know what page we're all on.
I agree that the Library, as the creation of the Forger, is a bit much. Like the city, it steals a bit of our thunder if the Forger does too much. Ideally, he's some primal force of creation, speaking seldom and seldom seen. He's known through his works. The Library can still work though, as a mystery. There could be rumors of a place...perhaps even an entire plane...where knowledge is stored. It could even be a sort of "elemental" plane of Knowledge, so vast and complex that it's all but useless unless you know -exactly- what you're looking for. Not the creation of any known agency, it simply is. The Platonic ideal of "libraryness" sort of.
Alternatively, you could introduce NPC gods.
Oh! I had an idea too.
Confronting the whole, "We are gods, what can challenge us," angle. What if sometimes we play not our deities, but rather divine chosen champions? Gods often choose to act through intermediaries. Especially as we ascend divine ranks, having less powerful (but also less risky to use) champions and avatars will become necessary. Then, if we want to plunder some library, we wouldn't go personally...we'd send Moktar The Bold...perhaps a demigod in his own right, but not invested with divine ranks. Or whatever. The idea needs some fleshing out, but just in general...
Whuddya think?