Ziggurat Chamber

Ziggurat (stone, 3 levels, 20' x 20' base), weird air
(crackling, ozone smell), decorative head carvings (on
all walls), stairs (up 10', west), door (north, to stairs up).
The cultists use a ritual that opens a green portal,
connecting the top level of the ziggurat with the jungle
~50' above. At night they bring new gagged victims.