[Spoilers] Emperor’s Domination - Need help with a title.

I started this novel a couple of days ago currently I'm on chapter 288, I remember reading about the explanation about true gods but it was really late at night and I was half asleep while reading it, so I forgot the meaning. Can someone please explain this title me, and how strong are they exactly? If someone can also refresh my memory on Chi Xiaodie's ancestor, I can't remember what Li Qiye tells her about the relationship between her ancestor and the Myriad True God (Little Autumn's master).