Building 7 rooms

HALF-FUNGUS:         PLANT
TWO-HEADED BASILISK: MONSTER
THORN URCHIN: VERMIN
HALF-APE: HUMANOID
HORNED GIANT: BOSS
ASH GOAT: CRITTER

G
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B
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E--A
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C
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D--F
Room A.
SMELL: Strangely warm, like being in a kiln.
HORNED GIANT is having tea party w/ nervous HALF-APEs, kidnapped PHALRIGHT the LYING BISHOP. Will insist that you join it. Will murder people for impoliteness, reward proper etiquette w/ fine and expensive cakes.
Room B.
Couple of HALF-APEs around shallow pit, gambling on combat between trained THORN URCHIN. Intruders will be hurled into pit, but if you wait long enough the furious loser will accuse the winner of cheating and a fight will ensure.
Room C.
SMELL: Metallic tang of hour-old blood.
SOUND: Hiss of steam escaping through cracks in floor.
Iron portcullis, HALF-APE on other side asking substantial fee to raise it. Will slam it shut when you're directly under it to try and spike you to death. If you approach this from the other side the HALF-APE will also be on the other side, it can squeeze through the bars.
Room D.
Enormous pile of LANTERN OF PLAGUEs, all exactly alike, dumped haphazardly in corner. Only one is real. The rest are clever fakes that have a 25% chance of working once and then break. Somewhere in room F is concealed the secret of finding the real one. Possibly in someone's brain.
Room E.
TWO-HEADED BASILISK den. Sulphuric fumes vent from somewhere deep within. Contains skeleton holding BLUDGEON OF THE PIT, which in addition to other powers gets +2 against TWO-HEADED BASILISK. 50% chance that TWO-HEADED BASILISK is out. Secret way out of dungeon, big enough for monster to fit through.
Room F.
Lightless oubliette. ATRAGOTH the SERVILE DUELIST has been trapped in here for at least twenty years, some HALF-APEs coming by to feed and water them occasionally.
Room G.
Map room. Globes, nautical charts, atlases, blueprints, guidebooks. HORNED 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.