Ohhhhh boy this is a big 'un. I've had to sit back and read, and re-read, and talk to others to try to figure a way out of this crux.
It's not easy.
Personally my vote is to let the Starchild Arc slide to the wayside but this leaves another question. What do we do with the product of centuries of work by the Pantheon to create a tool for their use: Merai.
As Raven said, the entire idea for the Starchild Arc was to cast the entire Pantheon to earth, leaving the Heavens/Hells without anyone(thing) able to assume the vacancies. This had its own complications which only begins to be problematic ten or so centuries into the future.
Raven:
1.) Merai does what Kammoloth wanted her to do: strips the daedra lords of power and gives it to the aedra.
As I see it this is the worst possible situation. Not only are the aedra left in control of the Heavens, they have absolutely no balancing factors whatsoever. The Daedra, while still extremely powerful beings, are trapped on earth and subject to the whims of both mortals and aedra alike. The degree of chaos that would ensue from people trying to gain control of, kill, support or resist the daedra would be immeasurable. And then there's the machinations of the daedra themselves… amassing power, striving to kill one another (as I said on IRC: It would turn into a bad episode of Highlander) to increase their personal powers would only further compound the problems that they cause.
And then there's the fact that the aedra, unable to directly manifest on the corporeal plane except under very limited circumstances, would not be able to take a direct hand in keeping the daedra under control. Thus, the gods of order and control would assume the Heavens/Hells and things would slowly stratify to a rigid crystallization of right/wrong in the world while the gods of chaos and death would be left running amok in the mortal world…. turning it into Mordor in time.
2.) Merai is corrupted by Suspira.
This is possibly the best option we have available to us at this point.
Not only does it deal with the question of Merai, an extremely important fulcrum of fate, but it allows us to opt into or out of the situation that this causes. I discussed it at length with Matthias and it sounds very much like a LToY level event that takes place beneath the sheen of every day life.
Here is the essence of the plot we discussed:
Merai is captured & corrupted by Suspira, but no one knows precisely what happened to her (I would imagine this would cause Lothanassa Raven no end of stress). She is missing for the better part of a year or more.
When next she appears it is at the head of the Elcaran circle of Lothonassi. An edict is drafted from the Elcaran seat that removes Raven from her role in the High Council (or whatever it's called) of the Lothonas in Elcaran. She cannot be excommunicated entirely for she has committed nothing of criminal degree, but Merai understands how much of a threat she poses so bottles her up in Metamor where her influence over the Lightbringers beyond Metamor would be minimal.
With no one able to contest her Merai begins to spread her influence throughout Sathmore. Already stressed considerably by the wars taking place in the Midlands this is an easy task.
In Raven's stead the acolyte Lightbringer Elvmere begins to bring those unsullied by Merai's promise of power (et al) to him. While the world at large looks on not very concerned with the increasingly militaristic bent of the Lightbringer Order a slow internal power struggle begins to ensue. Elvmere gains considerable following and from that following begins working more and more overtly, through his various followers, under Raven's distant leadership, against Merai's influence.
The Aedra and even some of the Daedra, understanding how Merai's actions will unbalance the power between them and their fellow Daedra, cast their lot in with Elvmere. They do not grant him any overt powers, that is not the way they can operate, but they work to swing things in his favor.
In due time Merai looses her seat in Elcaran and retreats to the secondary stronghold of Silvassa. There she is marginalized and the balance of power in Sathmore begins to swing back to normal. Elvmere never attains any great degree of rank within the Lightbringer order, as he has never desired any and would refuse such boons. He has other goals not germane to this discussion. Merai corrupts Silvassa to the point of secession from the Sathmore empire and Pyralia jumps on the opportunity. Suttaivasse, then one of the greater powers in that region of Pyralia, with mercenaries from Brecaris and the White Tower, overwhelm Silvassa and absorb it into the Pyralian Kingdoms, capturing Merai and … well, what they do to her then depends on Raven, I would think. Malger might convince them to turn her over to Elcaran (Lightbringer Raven) for trial.
There is a key thing here that everyone should consider:
If we go with this, or a plot similar to this, all of the writers will have the opportunity to opt into or out of the entire storyline. They can even choose sides!!! This will allow them to expand their plots beyond the limits of Metamor Keep.
This will give Metamor a powerful foe that is not Nasoj, and all of the political & theological implications this entails. But it is not disruptive to the world as a whole. Inconvenient, at most, unless Sathmore falls entirely to corruption and goes to war with itself or the midlands or even Metamor (or everybody at once).
The Starchild Arc, no matter how it is worked through, does not allow writers this option. They are all involved, regardless of their personal feelings on the matter. That is why it took me the better part of a year to convince people that the Winter Assault idea had merit… I had to, because all of their characters would be involved in it.
3. ) Merai doesn't fall to the dark side, but rescue doesn't come soon enough and she dies.
This solves the entire problem succinctly and we need not worry about the Pantheon being cast down or the Lightbringers being corrupted… but it's a rather lame conclusion, IMO.
Kit Sune:
Alternate Idea — The Starchild event does happen and the Pantheon is cast down, but their celestial 'children' take up the job of running the heavens/hells in a much diminished capacity.
Well, this could certainly be the case. Their celestial children (by lesser beings, I do not recall the gods actually reproducing with each other except perhaps Suspira with any she could seduce) lack the divine touch that enabled the Pantheon do harness the power of the souls they bring in or the prayers dedicated to them. Nor can they be conduits to the higher or lower planes to which such souls transcend (Heavens or Oblivion, depending on one's overview) so the souls are left to languish where they end up when their mortal bodies perish. Reincarnation as a belief system ceases to exist, but ghosts begin cropping up like a bad infestation of weeds.
I know for one that Nocturna has no children by any mortal or celestial being, but of the fallen Pantheon she is still capable of reaching her plane though no longer has power over it.
In this much weakened state the Lightbringer order begins to weaken and in due time the entire faith is absorbed into the Ecclasia with the new Pantheon (same powers, much weakened, with different Names) being claimed as nothing more than Saints (or demons).
The corporeal Pantheon causes the same degree if strife they would otherwise cause once they are cast down but the belief in them being cast from the heavens is much less since the Lightbringers still have their divine 'powers' (granted by the lesser celestials rather than true Gods). The chaos of their presence in the corporeal realm will only last a century or two before stabilizing in power centers dedicated to each that wishes to assume power, while those that do not essentially disappear into their own personal hiding places in the world.
My only issue with the entire idea of bringing the Pantheon to earth:
It takes otherwise untouchable beings of massive powers into tangible living, breathing, approachable and usable entities in the world. The opportunity for abuse is monumental and would need to be restricted even more so than they are now. Someone would be required to review all plots that involved them in any direct way, compare them to all other plots, and keep their use under strict control. Some poor sod is going to have to plot out what the gods do, and where, and make this calendar available to future writers to work with or around; all future writers will be forced to consider the location and activities of all overt acting members of the Pantheon (those causing chaos for their own personal ends) in their stories even if their interaction is only tangential.
As I said… with the Starchild Arc no one has a choice, now or in the future, to opt in or out of the events that occur. This is why Raven has given us a decade to come to this point, and now that we are here and our lifestyles, viewpoints, and ability to continue forward with that plot are different we must decide: yes or no.
Well… *whew* That's my $0.02, take it as you will.