A narrow maintenance tunnel ends in a sealed vault door. Inside is a small spherical room that glistens with an opalescent sheen. Dozens of small nozzles dot the floor and pairs of metal probes (copper) coat the ceiling. The east wall is a lattice work of holes revealing a passageway beyond that flows north to south. Every round, the chamber is filled with aerosolized metaline from 3.9 and electricity arcs across the ceiling, causing the metaline vapor to ignite. Anyone inside takes 3d10 damage. The lattice shifts left to right acting as a valve for combustion that has flowed further into the apparatus.

• Metaline — If the machinery in 3.9 is disabled, the aerosolized metaline will not fill the chamber; see 3.4 for radiation effects.