| Category | Strongholds |
| Continent | Brucrumus |
| Region | Lands of Purity |
| Owner | Ningizzida |
| Built | 16 Brighstar 832 |
| Map | Adellum |
Agdúrn is an immense stronghold situated in the eastern regions of Sinarag. The fortress rises as a moss-green bastion from the fetid swamp, resembling a colossal spear. Its walls are easily scalable due to the thousands of vines that creep along the sloped surfaces. The garrison has abandoned the never-ending task of beating back the creeper vines and other vegetation that cling to the walls like a web. The remote location of Agdúrn and the perilous wetlands provide a formidable defense against all but the most courageous of attackers.
In the First Epoch, Agdúrn became a gathering place for Troll and Graagvrii tribes. They would convene here and occasionally forge temporary alliances to launch long-distance raids against Farinteen's frontier settlements. By the commencement of the Second Epoch, Agdúrn had expanded in size and population, transforming into a permanent base for a lineage of Lorhazi leaders. The naga Ning'izzi struck an agreement with the region's two prominent cults, the Sanagar-Umlâs and the Borurthane. In exchange for supporting her in unifying the tribes and establishing an empire, she relocated the seat of government to Nagapolis, leaving Agdúrn to be governed by a council of ministers from the two supporting cults.