User blog comment:Supahbadmarine/Unholy Nightmare!/@comment-2253300-20110302180541/@comment-10514705-20110306122700

Also, we need to keep in mind it was the Old Ones that helped curtail the C'tan's presence and that they seeded the galaxy with a lot of species. If there weren't any Old Ones in this galaxy the C'tan wouldn't have any serious opposition. They could gain the power to draw power from emotion and they could take on the role which the Old Ones has in our Galaxy; seeding the stars with life forms capable of feeding them. This would also mean that there would be no Psykers; but maybe the C'tan, in their near God form, good bestow gifts of a similar nature which would allow mortals to wield the same kind of unholy powers that Necron Lords can use (through the use of various weapons). You could have one race which weren't seeded who have developed some connection to the warp, allowing chaos with a way if breaking into the material realm.