User blog comment:Venithil/Venithil's Monmusu Productions and Ideas/@comment-24431359-20140130045010/@comment-4991168-20140130050326

All MGE books happen in the same universe and Wicked Deity's a modified version of this universe as explained above and in its information chapters.

If you're asking this because I pit Deruella in, I figured I should use the one official Lilim befoere introducing original ones. Though I think they've made another one now.