Consider the following plan to deal with the Curses. It's the most straightforward, even if it's probably very hard to actually pull off.
1a) Locate, send an expedition to the right Croneworld, and retrieve the Deathsword.
1b) Do a massive scavenger hunt across the Crone Worlds, True Stars, and dead Craftworlds to try to find a functioning Voidcannon.
2) Spoof Kairos with visions of fabricated scenarios to make him believe there's an irresistible opportunity for him somewhere to lure him out and perma-kill him with either the weaponised Death-of-the-Universe-Foreseen or by throwing him outside reality.
3) Work together to raise a mighty host of Eldar, pooling all our knowledge and tools to build a military force of tremendous strength
4) At the moment of Horus' confrontation with the Emperor, invade Nurgle's Garden and seek to free Isha from her bondage and evacuate her to the Webway.
5) If Isha escaped and lived, simultaneously have Eldar across the galaxy perform rituals of worship to Isha as Queen of the Phoenix Court-in-Exile and bonesing new temples to her in her new aspext into existence.
It might not work, and it's certainly very hard, but it seems like it wouldn't require soulforging.
What it would require is that all Eldar put their differences aside and work together rather than prioritising scoring political points and hammering at each other's sensitivities to make their differences rather than commonalities most salient.
And yes; in that scenario, Nixon's Madman Theory applies. The apparently least rational person in the negotiations has an advantage. That's just the way it is though.
We have a QM post that outright called out Biel-Tan as part of the conservative block due to "No-Soul-modification" ever.
Edit:
Just to add the quote if people missed it.
Something I've mentioned before is that as I understand it the Conservatives are morally conservative. They're not socially conservative.
The Exodites are the arch social conservatives. We're ourselves much more socially conservative than the Path following Craftworlds, who are incredibly socially radical.
There are dimensions to small c conservatism. The Craftworlds differ in what they want to conserve. We want to conserve our pre-Fall mentality but are ready to jettison the pre-Fall moral codes that said soulforging was sinful. The 'Conservatives' have embraced radical and fundamental lifestyle and personal mental changes (the Paths are themselves very transhumanist in a way, as they involve ritual and psychic practices to edit one's own personality and only express a fraction of yourself at a time, instead suppressing the great majority of who you are until and unless you adopt a Path that embraces that part). However, they've said sticking to the pre-Fall moral codes is worth the sacrifice of living such incredibly limited lives.
This is why lots of Craftworlders abandon the path to become rangers. Corsairs, or worse. As a ranger or Corsair they can express the full range of their personality at once.
This indicates that the Conservative craftworlds are very unlikely to be at all stagnant at the moment, they're likely to be going through a dynamic ferment of cultural change as the impact on the Paths on individuals, institutions, and wider society and the economy work there way through, continually throwing up problems to be solved and opportunities to exploit.
We shouldn't be throwing stones like stagnant around, the other Craftworlds may become so, but at the moment they're the exact opposite.
We've been spared that as we've decided to just keep mostly acting and thinking like we did Pre-Fall. We've lost our technology, but we've not fundamentally changed we we are mentally as the Craftworld Eldar have just done. We're just putting up with suffering more from the Thirst than an Eldar on the Path does.
I suspect that's why Biel Tan hates us so much. We clash with them on both axes.
We're morally radical and socially conservative.
They're morally conservative and socially radical.
Our social conservatism is a threat to all the socially radically Craftworlds leaders as were an example that perhaps their populations don't need to radically transform their minds, lifestyles, social institutions, etc, and can instead just keep those as they were before. Change is hard, and we're an implicit suggestion that change isn't necessary.
Our existence encourages other Craftworld's people either to defect to live somewhere less unpleasant (being on the Paths is apparently both very hard and a horrible experience for the Eldar), or to try to find new leaders who don't want to embrace the Paths. This is particularly true as our moral radicalism probably isn't obvious yet.
This is potentially even a bigger long term problem for the leaders of the neutral Craftworlds. They've asked their people to make some enormous and very hard sacrifices, asking people to give up most of who they are most of the time, becoming shadows of their true selves that they could be before the Fall. And unlike the morally Conservative Craftworlds, they can't even use the justification that the other approaches would be a mortal sin, as they no longer care about whether it was a sin or not. If they no longer care about trans-eldarism, any success we have will make the decision to adopt the Parhs and the leaders who made it look foolish.
