Located thirteen steps above Room A, this gallery is dedicated to the supramundane realm, life, and the rulers.

It replicates the stepped design of the previous room, creating the sense that the exhibition takes place within a seven-tiered pyramid, a sacred space where deceased lords, gods, and celestial lights come together.

Three display cases showcase tools and materials acquired through trade with various pre-Hispanic peoples. One section features thirteen sculptures of rulers, each one ritually decapitated by the Chenek. This arrangement portrays a grand scene of power transition, with a staff of command at the center—the ultimate symbol of authority, adorned with fantastic masks of gods from the underworld, sky, and earth, as well as the celestial twins, the sun and moon, all bound by a deadly little serpent, the nauyaca.