Phandelver and Below: The Shattered Obelisk

Nightblade:

"This hallway seems to end in some kind of puzzle door," says Nightblade.  He looks over at Jorzu and Bryony, saying, "That is the way the escaping cultist went--beware."

Looking into the western hallway, Nightblade (and Boona, dimly) can make out a few Dwarven characters above the large dial on the far wall. The dial has a faceted indentation, like a socket. Fourteen carvings cross the dial, which has a fixed arrow pointing downward at its top.

Looking south, Bryony sees very little, while Jorzu examines the blackened pillars from afar. Bryony does hear something, however, a subtle bubbling sound. She also notices a faint green glow emanating from the west end of the room.