The Septemari Heartland is a majestic territory of towering urban centers and hidden subterranean cloisters. Home to the Septemari Sinner people, the landscape is defined by its architectural ambition and secretive depths. While the surface reflects a high-culture society of marble and glass, the underground holds the true history of their defiance. To outsiders, the residents appear human until their metallic irises or geometric skin patterns catch the light, marking a legacy of ancient rebellion.