Somewhat south of here is the location of the Lord Stone, which can be found in activators. These kinds of Doomstones are accompanied by smaller stones using the same textures, which can be found in statics. The smaller stones should be arranged in the shape of the constellation of the Lord, seen here:

The stones should be placed like the stars, with the actual Lord Stone taking the place of a prominent central star.
This claim can use one or two other points of interest, but not too close to the fort.
Check the Claim map topic for information on this region.