Page 114 of the new rulebook. Aeldari factions, one is listed as ++REDACTED++ and bears what is unmistakably a Slaaneshi symbol beside it. Is it just me, or does this seem to suggest that not all eldar were necessarily opposed to what happened? I remember in... The First Heretic, I think? Lorgar was shown a vision of the Eldar's Fall and it was explained to him that they would soon be faced with a "choice."
To my knowledge, this is the first time we've learned of an eldar faction that is not one of the ones we've already known. The other eight listed are Aeldari (referring to the race as a whole), Exodites, Craftworlders, Corsairs, Outcasts, Drukhari, Harlequins, Ynnari.
The artwork is curious as well. Anyone have any ideas?
Actually this has been touched on recently in Black Library. In the Phoenix Lord novel Jain Zar: Storm of Silence by Gav Thorpe the aftermath of the Fall, which takes place over centuries rather than a short period of time, is shown and part of the story is Jain Zar and Asurmen searching for other Eldar survivors. At one point they find a collective of Eldar that call themselves Nir Erva Vanamin, they cosmetically alter themselves to appear almost indistinguishable from another and follow a practice of Harmony. They allow no privacy of thought or emotion, permanently connected to each other by their "Harmony Gems", and speak of the Saviour that created them while allowing none to rise above another. Their voice Daivanesh talks to Asurmen about their duty to spread Harmony across the galaxy and bring all under the Saviour's gaze, a path of utter conformity of thought, emotion, appearance and life.
A very creepy Slaaneshi cult. Don't know if they survived the millennia or not, but I doubt it. Chaos Eldar is an interesting concept and this shows that Asuryan's Children can fall for the lies of Chaos just as humans can.