Before I begin with some additional thoughts, let me say I very much like/support the theories involving the alien invaders being Xan desendants and that the death screams heard when the beast was killed were empaths linked with the source. So if any of my ideas contradict those please take it with a grain of salt. What follows is a somewhat jumble of ideas, but its hard to begin a discussion on them if I don't at least throw them out there - unrefined as they may be.
There was some talk at one point in this thread regarding the expansion of the universe. I'm wondering if anyone else has made the connection that perhaps the Source is the located where the Big Bang originally ocurred, assuming AO lore subscribes to that theory (I'm not interested in arguing whether the Big Bang actually ocurred in real life or not. As far as this thread goes, I'm only interested in how these theories may possibly be linked to AO's storyline. Unfortunately I think that argument kind of derailed some potentially enlightening story discussion earlier in the thread).
[Try to stay with me on this, because these ideas are still rough and a bit derivative. In other words...I'm reaching, but at least I'm aware of it
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I believe there are some elements in the Big Bang theory (which is directly related to the expansion of the universe) which may shed some light on the Alien Invasion. There is discussion about whether the universe will just drift apart forever, if it will just sputter to a halt, or if it will one day collapse back in upon itself...
Now, assume the Source is the original power behind the Big Bang, and the Source is thereby connected to everything in the universe. What would happen if someone started trying to harvest this awesome power that created our universe, and ultimately ended up corrupting that power (or at least corrupting the balance of that power) as seems to be the case with the theories regarding the notum/novictum balance mentioned throughout this thread. Could this lead to the collapse of our universe, or somehow otherwise lead to its destruction (perhaps even in the form of a brand new Big Bang)?
If the invading aliens (which I'm assuming are at least descendants of the Xan, if not original Xan, for purposes of my theory) live near the border of the expanding universe, might they be the first to feel the effects of this corruption? This of course would compel them to zoom back to their old homeworld on Rubi-Ka to deal with whatever was causing the problem.
In our story, we have this ancient race of Immortals (the Xan - who were perhaps even among the first sentient beings in the universe) who encounter this ultimate power. And like any sentient beings we know, they are tempted to tame, guard, or otherwise control this power, which ultimately leads to chaos, destruction, war, and a division into factions.
[Darn, have to go now, but I'll leave this as is for now, and hopefully finish/refine it later, although my primary ideas are already there]