To ensure survival, the Lighthouse operates under a brutal and cold caste system:
The surface of the Earth is now dominated by the , a terrifying biological system of monsters (Mana beasts) that consume the life force, or "ghalla," of living beings. To gather resources from the surface, elite soldiers known as Hunters must descend into this nightmare. The Story of Marc Ling Long: Incarnation
During a desperate surgery to save his life, Marc is fused with a parasitic monster. He eventually transforms into a Manna chimera —a beast with a human soul—and is forced to leave the Lighthouse. To ensure survival, the Lighthouse operates under a