Inside: a vast atrium filled with floating platforms connected by glass bridges. The ceiling is a swirling starry void. At the center, a pedestal holds a glowing key and a message: “One must stay. One must lead. One must… end this.” The key vibrates in Marcus’ hand. He hesitates. The group realizes the key isn’t for escape—it’s a tool to reset the map, collapsing dangerous sectors. But using it here would require sacrificing someone to stabilize the structure.