


To ensure their survival, the remnants of humanity began living within defensive barriers, resulting in one hundred years without a single titan encounter. What makes these giants truly terrifying is that their taste for human flesh is not born out of hunger but what appears to be out of pleasure. Centuries ago, mankind was slaughtered to near extinction by monstrous humanoid creatures called Titans, forcing humans to hide in fear behind enormous concentric walls. Yupa reports three countries were swallowed up by the Sea in the South in the past several years and argues that the continent will be covered by the Sea within a century. When insects get angry, they go on rampages and inadvertently expose clean land to deadly spores. The Toxic Jungle is constantly spreading. There are two groups that interact with the Toxic Jungle on a near-daily basis: the Forest People and Worm Handlers. The spores take root in the corpses and the deadly fungus grows. The plants scent food, like dead bodies, and release spores to grow the Toxic Jungle, eventually covering the food with spores. The plants in the Toxic Jungle are made up of various fungi that release deadly spores into a Miasma. The strata is a centuries-long process to turn the poisons of the miasma into "harmless, stable elements.reduced to tiny crystals, too small for the eye to see" and clean the world. The air is clear and there is no miasma there. The middle layer is still poisonous and is known as the Petrified Layer.

The topmost and most poisonous is the Active Layer. The Toxic Jungle has several layers or strata.
