Orcish Pass

The Orcish Pass is the only convenient passage through the Spine Mountains, which connect the Known World with the mysterious eastern half of the continent. It is called that because every couple of months, a giant party of orcs emerges from the pass to raid the farmlands, taking crops, horses, and prisoners (usually children). At the mouth of the pass is the city-state of Thrownin, which was originally established to combat the orcs.

Another thing to come out of the Orcish Pass is Tieflings. This is the only place in all of the Known World that Tieflings come from. Furthermore, the only Tieflings that come from the Orcish Pass fall into three categories: babies, who have been rescued by soldiers after the parents were killed; adolescents who are running the hell away from their homeland; and slavers, warlords, and warlocks who arrive alongside the Orcs with intent to pillage and conquer.

No war party that has been sent through the Orcish Pass from the Known World has ever come back.