The Peace Accords signed after the Great Purge was said to have been a groundbreaking achievement by both the Great Families and the Rulers of the Night Creatures.
It helped to stop further bloodshed and allowed both parties to come to terms that would be favorable to future generations.
The Accords saw the Rulers of the Night Creatures and their denizens retreat to the Eastern Highlands which they then corrupted with their essence to mark the area as their territory.
Of course, not all of them left for the Eastern Highlands of Ra'as and those that didn't came together to form what would be known as Strongholds.
Each Stronghold had two things in common; they had a high number of Night Creatures staying in them and secondly, the location held historical value.
Krobridge was one such location.