IMTU, I've decided to use something from Fred Pohl's Gateway series, suitably adapted. I've always thought that the stated reasons for Yaskoydray to retire to his own pocket universe seemed a little lame.
IMTU, I think I'll have the Ancients discover evidence of an inimical form of life, that periodically emerges from black hole isolation to destroy all other intelligent life - we'll call them the Assassins. Yaskoydray and his children fought over the precise method of confronting this issue, with Yaskoydray advocating the "hide and wait" strategy and his children advocating something more proactive (and probably less wise and patient). This escalated to the Ancients' War when Yaskoydray realized that his children's activities could alert the Assassins to the presence in the galaxy of other intelligent life; Grandfather's solution was to destroy his children who disagreed with them, to prevent the Assassins from finding out about the Ancients. Afterwards, he seeded a whole bunch more planets with life, so that he could get the maximum possibility that someone would arise to challenge the Assassins. Then he pinched off his pocket universe so he could wait in peace and relative safety. His machine intelligences monitor what goes on in the regular universe to keep him apprised if any intelligent race manages to deal with the Assassins. And the galaxy is starting to get very noisy...
Now I just have to figure out how to include the Empress Wave.
Spoiler:
In the Gateway universe, the humans find ancient artifacts left by the Heechee, a race that predated ours. They eventually find that the Heechee have fled the universe into a huge black hole at the core of our galaxy. They fled because they discovered the Assassins, an even older race of energy beings, who find our universe too painful to live in... so they plan to remake it. They're responsible for the "missing mass" effect - they plan to cause the universe to experience a Big Crunch as opposed to letting it die out with a whimper. And as it re-explodes in a new Big Bang, they plan to alter the conditions there to force the next universe to be more congenial to their kind of "life." Meanwhile, the Assassins have also retreated to a form a black hole, called a kugelblitz, it formed when energy density caused space to fold, as opposed to a black hole formed from matter.
Anyway, the Assassins periodically emerge from their self-imposed exile to wipe out any new lifeforms they encounter that seem on the verge of spaceflight, so that no one else can mess with their Great Work. The Heechee deduced this from evidence and the one surviving race that was visited by the Assassins (they were blasted back to the Stone Age, essentially) and fled to their black hole to wait for someone else to fight the Assassins. That "someone else" turns out to be us.
Anyway, the Assassins periodically emerge from their self-imposed exile to wipe out any new lifeforms they encounter that seem on the verge of spaceflight, so that no one else can mess with their Great Work. The Heechee deduced this from evidence and the one surviving race that was visited by the Assassins (they were blasted back to the Stone Age, essentially) and fled to their black hole to wait for someone else to fight the Assassins. That "someone else" turns out to be us.
IMTU, I think I'll have the Ancients discover evidence of an inimical form of life, that periodically emerges from black hole isolation to destroy all other intelligent life - we'll call them the Assassins. Yaskoydray and his children fought over the precise method of confronting this issue, with Yaskoydray advocating the "hide and wait" strategy and his children advocating something more proactive (and probably less wise and patient). This escalated to the Ancients' War when Yaskoydray realized that his children's activities could alert the Assassins to the presence in the galaxy of other intelligent life; Grandfather's solution was to destroy his children who disagreed with them, to prevent the Assassins from finding out about the Ancients. Afterwards, he seeded a whole bunch more planets with life, so that he could get the maximum possibility that someone would arise to challenge the Assassins. Then he pinched off his pocket universe so he could wait in peace and relative safety. His machine intelligences monitor what goes on in the regular universe to keep him apprised if any intelligent race manages to deal with the Assassins. And the galaxy is starting to get very noisy...
Now I just have to figure out how to include the Empress Wave.
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