Biodefense Chamber B is a type of room located on the Celestial Archives, Alinos, Vesper Defense Outpost, and Arcterra. The chamber is always the ultimate room of every second Stronghold Void on all four of the worlds, and is the location of all Slenches. Biodefense Chamber B is much larger than Chamber A; the walls and floor are made of a purple metal, and the wall facing the entrance features all the mechanisms that the Slench requires for battle. (Except the room where Slench 4 is fought, in which it is on the ceiling) Destroying the Slench yields an Octolith and Energy Capsules.


Defeat the Slench.

Logbook entryEdit

Biodefense Chamber B

Metroid Prime Hunters

Logbook entry

Those who dare trespass upon our sacred chambers may expect to pay dearly for that which they would seek.