The Warehouse B is a huge room, which looks almost exactly like Warehouse A, as it is located directly underneath it. It has a huge metal door and three white Chromatic Doors. Unlike the Number Nine Door in Warehouse A, the metal door in Warehouse B can be opened from the outside once the Nonary Game ends.
On one of the walls, graffiti has been written on it, and it says "MEMENTO MORI, IF THE NINETH LION ATE THE SUN", which is an anagram for "THE MAN ON THE MOON RULES THE INFINITE TIME".
Sigma finds this room usually after solving an escape room behind the second set of Chromatic Doors or he hears about it from another group that had found it first. The only endings that Warehouse B does not appear in is Quark END and Quark Game Over.
- Rhizome 9 contains nine images of "lions eating suns" in the escape rooms. This is what the graffiti means.