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@Boljin This is still pending, but as of my plans for the story, the eldar are free from the reaches of chaos. Since this is an entirely different galaxy and time, the woih never occurred. The warp in halo is such a paradise that the psykers are scared out of their minds, it felt too good to be true. Skyla literally led an entire fleet alone because the other navigators are out of action, and she manages to do so with little hiccups because of how clean and untainted the warp was. It is also for this reason that Hyperion, when he arrived at the craftworld, did not immediately run up to fight. Aside from being surrounded and alone, he instinctively knew that these eldars are much stronger than the 40k ones because they are no longer hiding their true power. Adding two of their gods are alive (clowny is out of action for the moment, he was injured in the escape) makes the eldar of these ff to be REALLY strong and are recovering. Of course they won't fuck themselves to death this time since they KNOW what would happen if they do and are not willing to waste their second chance.
SPOILERS BELOW! IF YOU WANT TO KNOW WHY I MADE THEM THIS WAY!
Remember when Isha described how big e essentially throw hands with the gods to buy her and Cegorach time to escape? It was because big cheese hoped that with time and effort, the eldar could recover their power in the halo galaxy before coming back with them and some iom in tow to free the galaxy once and for all. Of course, this is a giant gamble but it is one big e took.