Ok, so we know that when an Eldar dies it has 2 options. Either it gets its soul immediately eaten by Slaanesh or it gets sucked into it's Soul Stone to be put into more ghost machines. But what if, for example, one gets captured and sent to be the midnight snack for The Emperor? Would the emperor absorb that xenos psyker soul? I mean yeah, they feed The Emperor mostly human psykers but is there any reason he can't eat a xenos psyker? It's the psyker soul that powers him up, does it have to be human at all? And what happens to the Eldar? Since it's not going to Slaanesh and it's not going to the Soul Stone it's going to The Emperor now. Does he have to like fight Slaanesh for the soul or is it just like "Hey! Those souls are supposed to be mine!" and Slaanesh just gets angry at The Emperor?