A cliff-top plateau, which is home to the Isthmus Keep, the Isthmus region is a part of Rosalia, having been wrestled away from the Bafal Empire. The Isthmus plateau also houses the Isthmus Cavern, which has a mysterious link to the old God Saruin.
To unlock Isthmus one has to:
- Recruit Gray
- Recruit Albert
- Reach Yeoville while playing as Sif or Albert
- Talk to the female NPC close to the keep in Loban
- Complete one of the 3 ending quests
Early on in the game, inside the keep, there's Albert, whom can be recruited.
- Find Chests