Casere was a marginally habitable world settled by peoples from Italy. It was never part of the Principality of Rasalhague, but was annexed by the growing Combine. It was brought into full bloom by Star League terraforming. It was the target of mass bombardment during the 1st War, and changed hands several times, with devastating consequences.

Some industries did survive, however, relocated deep into the underground to avoid the falling bombs. These remaining industries have been both a boon and a bane to Casere: centuries of mining and pollution, combined with radioactive fallout, has caused catastrophic deterioration of the planets weather patterns and climate. Hurricane winds, flooding and droughts are more common than not. Soil erosion has reduced agricultural output to about a tenth of what it was. Rising sea levels have turned the coast-lands into stinking mires. But the world continues to churn out essential war matériel, so there will be no respite.

Casere has quite varied terrain, but currently most of the inhabitants have been relocated to hastily built hillside cities, overlooking the once-prosperous coastlands. Here they are protected from the worst ravages of the weather by thick concrete walls, while they either toil in the factories or try to survive on government vouchers.

Casere has a potent militia guarding the three key urban areas (Bergamo, Brescia, Cremona) with their adjourning factories and spaceports. Each is located at least 2000 kilometers away from each other, and the garrisons are lacking in redeployment capability. Casere is through to be the base of the 3rd Sword of Light.