Fort Istirus is a three-level Necromancer dungeon located halfway between Kvatch and Skingrad south of the Gold Road and north of the Strid River. There is a Necromancer Altar just to the west of the fort.
A tree grows through the middle of the ruin and the fort's southern face has fallen open. Plants are abundant with Morning Glory growing on the ruins and Flax within. A couple of Cinnabar Polypore Red Cap grow on the tree and two Dryad Saddle Polypore Cap grow near the entrance. More flax and some Alkanet grow near the altar.
- Fort Istirus
- Fort Istirus Sanctuaries
- Fort Istirus Barracks
- Necromancer's Moon - Listed in the Hastily Scrawled Note as a primary site.
- There is a chance of finding a Black Soul Gem on one of the Necromancers.