User blog comment:Tholanar/The mightiest god in The Elder Scrolls!/@comment-5709731-20121216072847/@comment-5709731-20121222151010

As DarthOrc has already stated, creating takes incredible amounts of power. Creating a single plane(t) drained thousands of aedra to near-death. Imagine creating everysingle Et'Ada, and thus, every single plane(t) ever to exist, all at the same time? That is what Sithis and Anu did, perhaps not intentionally, and therefore they are so weak they can barely do anything.