What is the fine-grained topic of the following text: This isn't official Ærth, though: I felt that although Gary Gygax had done a good job of populating Ærth with all the major cultures (real or imagined) of the past, he should have included an analogue to Medieval Novgorod. Only return the topic.
Gary Gygax's omission of Medieval Novgorod in Ærth creation