Situated on the massive crescent-shaped island dominating the eastern edge of image_5afb57.jpg, Siddero is no longer a functioning society; it is a continent-spanning military fortification. This landmass is the primary theater for the Grand Vane Alliance's (GVA) "Sterile Defence" doctrine. The landscape is a blasted no-man's-land of scorched earth, constantly flooded with chemical fire and solar radiation to clear out the Malignant Concord's creeping spores. It is here that the GVA’s Filter Breakers and Anchor-Jacks advance their iron fortifications yard by grueling yard, and where the endless stream of conscripts serve out their terrifying six-month "Burn". Siddero operates on the ruthless Anchor Doctrine: units are trained to never retreat, and commanders will collapse entire tunnels to seal a sector rather than let a single spore-carrier breach the lines.