This quest makes you kill these mobs three separate times with reading the book in between. Best location is 636.00, -4.00, -530 near entrance to D'Morte Burial Chambers
Looked all over for Shadowed men for "Lay of the Land" Quest. The only place I could find them was at the Obelisk of Lost Souls. -51.08, 89.34, -2250.75