Between those three things, you are able to narrow things down to a group of older documents. Your instincts are not clear on which scroll is best, but your knowledge of the time period is surprisingly decent.
You eventually find what you are looking for. One of Eglas' scrolls from the end of the Sith occupation of Vudes.
You read that the Dark Ones were never driven from Vudes; the Vudans were powerless against their godly powers and divine fire-spitting weapons. Angels came to try helping fighting the Dark Ones, but never succeeded.
The Dark Ones, whom you know to be the Sith, just left one day, taking their flying vessels back into the sky and disappearing, one by one.
Except for one vessel that returned, decades later, and slammed into the coastline. This is further north than the Nurkish territory, but the shaman of the time could see the vessel when it came down, saw the fireball it became, and felt the earthquake it created.
You know where it crashed, then. The territory of the Vran, a warrior-minded Vudan clan.