The Edge of Barine
Each zone of the Ring has at least one Defensive Unit. These units are tasked with protecting their zone from any stray wild beast and/or goblin/kobold attacks. The primary Defensive Unit in each zone is referred to as the Forward Defensive Unit (or FDU) and in zones that have two units, the second unit is referred to as the Rear Defensive Unit (or RDU). The official designation for any one unit is FDU (or RDU) preceded by its zone designation (e.g. N1RDU). Defensive Unit leadership is located in zone N2, and they operate almost completely independently of the Scleral Council.