Building 7 rooms

STAR MEMBRANE: PLANT
WEEPING SHARK: MONSTER
LOGIC SCARAB: VERMIN
SKIN ORC: HUMANOID
PIRATE GIANT: BOSS
RAZOR PANTHER: CRITTER

F
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C--A--E
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G--B
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D
Room A.
SOUND: Every noise echoes precisely once.
SMELL: Air painfully dry.
Couple of sorry-looking SKIN ORCs roasting LOGIC SCARAB over fire. In surprisingly good mood, will share. If you get sick and pass out from the feast they will definitely kill you, but otherwise harmless.
Room B.
Dungeon cenote. Sides overgrown with STAR MEMBRANE, climbdownable. Beautiful turquoise blue water. Bioluminescent bacteria intelligent, psychic, capable of projecting terrifyingly potent hallucinations/activating devotional centre of brain to make you think you see God. Bottom of cenote littered w/ human skeletons from sacrifices. Bacteria feed off flesh. One exit through underwater tunnel, skeleton in tunnel clutches bag of diamond dust and wears water-damaged GREAVES OF THE SANDS. SKIN ORC cultists soon to return.
Room C.
Salt lick. Vein of salt (somehow) in wall of cave, RAZOR PANTHERs lapping at it. If you bring salt to other parts of cave the RAZOR PANTHERs there will lick it out of your hands and it will be adorable.
Room D.
SOUND: Rumble of tectonic plates shifting, impossibly loud and distant.
SIGHT: Ammonite, trilobite fossils visible in walls.
Looks like empty room. Actually maw of cave leviathan, those weird stalagmites its teeth. Glimmer of treasure deep in gullet is pyrite lure. RAZOR PANTHERs pick dead flesh from between teeth.
Room E.
Map room. Globes, nautical charts, atlases, blueprints, guidebooks. PIRATE GIANT studying X-marked plan of faraway island, so enthralled that it has difficulty noticing PCs. Exquisite rug on room's floor seems like abstract pattern, careful study reveals it to be map of dungeon itself.
Room F.
Bedchamber of three, four SKIN ORCs. Sodden and filthy. Careful inspection of damp rags that serve as bedding will reveal a(n) LANTERN OF THE DJINN in surprisingly good condition, but forces save against filth fever.
Room G.
Waterfall that trickles in through crack in wall, disappears in swirling vortex into crack in earth. Tricky climb, must be made to pass room. RAZOR PANTHER den hidden in cave behind waterfall, half-digested SCABBARD OF THE ZEPHYR in stomach of sleeping RAZOR PANTHER.