Redclaw, no worries, it's probably a DM fault.
So:
[sblock="Three Flowers"]
The disc is fully above the surface of the water, and it looks from the small bit of carving visible at the waterline that it has been represented as resting on a stand of some kind.
It looks like the disc is part of the carvings and has been coated with some substance that makes it glow (which has worn away on patches), rather than being one piece of seperate material. Three Flowers doesn't know what the glowing coating might be.
[/sblock]
[sblock="Growling Ape"]
The bas relief carvings all seem to be of humans dressed in Imperial style, all facing in the direction of the moon disc. They are quite simply carved, mostly variations on the same theme. There doesn't appear to be anything hidden or significant about them.
[/sblock]
[sblock="Xielt"]
The thing sticking up from the floor appears to be a metal ring, about a hand-span in diameter, attached to the floor. Either a handle or an anchoring cleat.
[/sblock]
Annika sees her companions search the room unmolested by any more water monsters.
OOC: Rolling Man, do you still want Jar'Thol to investigate the crack in the wall?