[X] Plan: Washout erosion
Dark Benefits
[X] Ally Team (3)
[X] Monster Mash (1)
[X] Eldritch Beings From Beyond the Stars (2)
[X] Dark Conquered Zones (3)
[X] It's a Magic, Magic World Out There (1)
[X] Mega Monsters (3)
Total: 13
Bright Benefits
[X] Multiple Generations (2)
[X] Rival Legion (3)
[X] Techno-Magic (1)
[X] Actual Aliens (2)
[X] Mask Magic (1)
[X] Mascot Mentors (1)
[X] Big Good (3)
Total: 13
Everybody looks to be planning to be an antagonist team, but that's for suckers.
The corrupted zones, monsters, and eldritch beings mean that the Dark Girls wouldn't need to instigate anything.
The magical girls would have to be actively dealing with problems, and instead of fighting the the magical girls? We show them up.
Sow uncertainty in a new generation, and get the magical girls questioning if they're actually on the side of good.
Show up to Eldritch breaches and show up the heroes in fighting them.
Show up to monster incidents and play the role of crisis handlers
Build up contact and support networks of and for monsters, and push for equal rights.
This is absolutely going to result in the Magical Girls attacking us, at which point it's fair to take their trinkets if we win (and flee if victory is unlikely, calling them out for starting a fight.)
Any trinkets we take, we use to make more Dark Magical Girls. Out of monsters we save from the Magical Girls.
This should result in low morale.
The Big Good, being a Big Good, will not give good advice.
Idealogues view everything through their own lens, and so they will see this as "suffering person trying to be good", or "victim lashing out"
So the advice will very likely be to extend a hand in friendship to try to sway us. Or, even better, to try to be a friend.
Since that's not actually what we're doing, we can use that to subtly feed their doubts.
Of course, once we have Dark Magical Monster Girls, we'll have people who can probably straight up say "your predecessors killed my family" and not be lying - really twist the knife.
Now, past that point is the system's time horizon - the point past which predictions can no longer be trusted - but it puts us in a fantastic position with the Magical Girls having poor morale, infighting, and mistrust for their own mentors.
Once we actually start recruiting Magical Girls, we can induct them into the polycule. We'll make the Narrator a harem protagonist whether they like it or not.
Edit:
Ah, I forgot to explain my choices!
Dark Benefits:
Ally Team: This is easy; action economics.
Monster Mash: Random monsters being around is useful. These are native creatures, and they're mostly going to be trying to just live their lives. That's exploitable.
Eldritch Beings From Beyond the Stars: Nobody likes them, not even our Patron, so they can be designated antagonists for us.
Dark Conquered Zones: This provides a constant force for Magical Girls to struggle against, and places where we can safely arrange forces and material without having to worry too much about it being discovered.
It's a Magic, Magic World Out There: Extremely exploitable. Just a good pick.
Mega Monsters: Honestly, I just added this to match the points, but random Kaiju attacks are a great opportunity for the Magical Girls to see us fighting the Kaiju and rescuing civilians, and then getting accused of helping the Kaiju attack.
Bright Benefits:
Multiple Generations: The conflict being so far back in the past that the current Magical Girls only have knowledge over how it started from what they were told makes it a lot easier to change their perceptions, and lets us exploit the history of this conflict (No matter what it is) to our advantage.
Rival Legion: We have no intention of picking a fight with them, or even trying to fight if conditions are unfavorable. More Magical Girls means more chances for infighting, and a greater likelihood of them splitting up.
Techno-Magic: Any trinkets we take can be turned into more Dark Magical Girls. Magical Girls become a renewable resource.
Actual Aliens: They're an overt external force putting their thumb on the scales, and "they decided our planet would make a great place for a proxy war" is a pretty good line.
Mask Magic: We have no intention of going after the magical girls. This is just a flat upgrade for us.
Mascot Mentors: Creatures giving the wrong advice? Sounds like a plan. Just keep ours away from the Magical Girls to avoid them running their mouth.
Big Good: The greatest source of bad advice for the Magical Girls. Let them give boons and advice; those only work in our favor.
