Yer Shar is a super-setting that powered a three year long campaign. It consists of additional sub-settings that represent more specific locales and different times than the original. In any event, what's presented here is a snapshot of the world as it stood prior to the opening of the campaign, retroactively informed by the material developed in-game, and reworked to use the Schismata mechanics. Some regions and locations are under-specified to allow for additional development later.

See https://blog.hilltown.studio/a-developmental-history-and-partial-bibliography-of-yer-shar for some insight into what went into this setting.