User blog comment:Disfigure/Pictures of Black Scripture Members from the Official Data Book/@comment-76.218.192.169-20151103044533/@comment-27008999-20151104100845

Okay then. But what I wrote about the empire worshipping only 4 gods (I actually meant the temples, the temples that heal people in NW believe in 4 gods, you know). This was either in the prologue or chapter 1 in volume 9 and also when Sebas saved Tsuare the temples were mentioned too.

Speculation: This could mean that the 4 gods both the empire and kingdom worship were once human players that were a part of the Six Gods, despite you said it was a fanfiction, it might make sense that there was 4 humans and two who were not humans. Whether the last two were a dragonoid, elder lich/overlord or an elf is unknown. But for some reason the kingdom and empire worship only 4 gods. The Slane T. have scriptures that worship different player of the Six Gods, some scriptures are smaller than the other, because of popularity.