The world lives and breaths. Take advantage of a vulnerability in the enemy's defenses a couple times, and they'll surely close that hole.
https://mindweaverpg.wordpress.com/2022/04/15/haven-fey-fortification/
The party ended up getting a little sidetracked by a whole nest of ogres.
#playreport
https://mindweaverpg.wordpress.com/2023/06/30/play-report-kotb-barrier-march-session-52-surprise-ogres/
Searching for more information about the lay of the land around the bugbear crag, the party ends up ambushing a patrol, but when the ambush doesn't get surprise, the battle is far more even than intended.